Math Fun!

[zRinne]

 

[ciwa]

1. 17 - 4 = 13 apples
2. 23 + 49 = 72 bricks
3. 9 * 7 = 63 seats
4. 55 / 7 = about $7.85
5. 1/1.609 * 14 = 8.7mi
6. 2x + 6y = 256
x + y = 100
2x + 2y = 200
4y = 56
y = 14 fill-in-the-blank
x = 86 multiple choice
7. Does not change...
8. 52! = too much that you gotta do it yourself (about 8x10^67)
9. 10C3 = 120
10. 26P5 = 7893600
11. x < 80
if that condition is fulfilled then it the more gas you buy the cheaper it is
12. at 0h, speed is 1km/h
at 4h, speed is 16km/h
acceleration = (4-0)/(16-1) = 0.267 km/h^2 (3 s.f.)
13. Can't really understand the exact question of the position of the ladder but I'll draw it as:

.| .\
.| .\
5m .| .\ 17m
.| .\
.|_____\
v264
( this 'triangle' was better in my text box)
I'm not sure if I gotta use differentiation to do this but,
at 1s; 4.5m on a wall; v(17^2-4.5^2) = x
x - v264 = 0.146m/s (3 s.f.) this one's probably wrong

14. f(7) - f(5) = 436L = 436000ml
15. f(128) - f(32) = -0.155 dollars apparently (3s.f.)

I probably have to use differentiation for no. 13-15 but I'm too lazy so I just do the 'logical' way.


Not even gonna do the bonus ones...

:eek:

 

[Ellie Williams]

#4
CLARIFICATION: Alice will keep the remainder. She is not among her 7 friends that she is splitting money to.

The tile also gets removed from the edge of the patio.

Sorry about that :P.

 

[MagnificentSpam]

#4
CLARIFICATION: Alice will keep the remainder. She is not among her 7 friends that she is splitting money to.

The tile also gets removed from the edge of the patio.

Sorry about that :p.

So like this?

Spoiler: 4

Each friend gets 7.85, there are 55-(7 * 7.85) = 0.05 left.

 

[PinkSparkleWolf]

I got an A+ (or 9.1 or 91% idc) for my first math grade this year (which is also the only one so far).
That's were my math life has ended.

Spoiler: NOTE

Except if a get another good grade ofc.

 

[Power Ranger]

Pls no more math I cam on the forums during math class to escape math D:

 

[Ellie Williams]

Honestly, if you can't solve 1-3, I suggest that you go back to 1st grade to take Arithmetic I. They cover a good amount of addition and subtraction there.

 

[MagnificentSpam]

Honestly, if you can't solve 1-3, I suggest that you go back to 1st grade to take Arithmetic I. They cover a good amount of addition and subtraction there.

Are you referring to me? :/ I tried my best on the other questions though. https://www.cubecraft.net/threads/math-fun.159361/#post-644759

 

[Thaus]

My best answers:
#1 13
#2 72
#3 63
#4 6
#5 around 8.7
#6 14 fill-in-the-blanks 86 multiple choice
#7 won't change
#8 52
#9 ?
#10 7893600
#11 I don't think gas prices can be negative.
#12 1/4 km/h/h
#13 24?
#14 436
#15 -.155

Bonus 1: 102,378
Bonus 2: the first one is infinity the second one is undefined
Bonus 3: i,15 i, 12 i
Bonus 4: True?
Bonus 5: 8*i*PI

 

[Thaus]

Hey guys, I've got some math problems for all of you :cool:! Problems are sorted according to their difficulty; easier ones are on top.

Rules:
-No cheating!
-You may use a four function calculator or a standard scientific calculator. Nothing else please (no graphing calculators, CAS, Java, etc.) Yes, you may use pencil, paper, ruler, reference books, etc.
-Try to do them without looking at the [possible] solutions below.
-Feel free to ask for hints, though I may or may not give them. It depends.
-You may collaborate with other people or forum users.
-I strongly encourage you to show your work and post it here, but you don't have to if you can't.
-Don't make random guesses when solving the problems.
-Don't worry if there are problems you can't do; just do the ones you can.

Spoiler: #1

I have 17 apples. I eat 4 of them. How many do I have left?

Spoiler: #2

Bob has 23 lego bricks. He receives 49 more of them. How many lego bricks does he have?

Spoiler: #3

A theater has 9 rows of seats. Each row has 7 seats. How many seats are there?

Spoiler: #4

Alice has $55. She plans to split them among 7 friends. How much money will she have left?
CLARIFICATION: Alice will keep the remainder. She is not among her 7 friends that she is splitting money to.

Spoiler: #5

If 1 mile equals 1.609 kilometers, how many miles are in 14 kilometers?

Spoiler: #6

A test has 100 questions. It is worth 256 points. Each multiple choice question on the test is worth 2 points, while each fill-in-the-blank question is worth 6 points. How many of each question type are there?

Spoiler: #7

A rectangular patio is made up of tiles are are 1 meter long each. A tile becomes removed from the edge of the patio. What will happen to the patio's perimeter?

Spoiler: #8

How many ways can a deck of cards be arranged? Hint: there are 52 cards in a deck.

Spoiler: #9

Bob has 10 candy in a pile. How many ways can he choose 3 candies from that pile? The order of which he chooses does not matter.

Spoiler: #10

How many 5-letter words can be made from the English alphabet? Nonsense words like "ehgyo" do count.

Spoiler: #11

The price of gasoline is defined by the function

, where f(x) is the price and x is the amount in litres. What price does f(x) approach the more gas you buy?

Spoiler: #12

A train leaves the station at x = 0 hours. Its speed is defined by the function

, where f(x) is the speed in km/h and x is the time in hours. At x = 4, what is the train's acceleration in km/h/h (kilometers per hour per hour)?

Spoiler: #13

A 17m long ladder is leaning 5m on a wall. It is sliding off the wall at a rate of 0.5 m/s. At this time, how fast is the bottom of the ladder moving (the side of the ladder that is touching the ground)?

Spoiler: #14

Water filling a sink is defined by the function

, where f(x) is the volume of water filled in litres and x is the time since the tap was turned on in minutes. How much water (in mililitres) was filled between x=5 and
x = 7?

Spoiler: #15

The amount of money going into a savins account is defined by the function

, where f(x) is the amount of money being filled into the account at any given moment, which is defined by x. How much money was filled in to the account between x = 32 and x = 128?

Spoiler: Bonus #1

Add up all the numbers from 1 to 452 in under 45 seconds.

Spoiler: Bonus #2

Evaluate the following limits.

Spoiler: Bonus #3

Evaluate the following radicals.

Spoiler: Bonus #4

Is this equation true or false?

Spoiler: Bonus #5

Solve this rebus ;).

Good luck have fun :D!

My question is do you know the answers?

 

[MrTokay]

I would do it, but I have no TIME PLS.
PS
Answers:

1. 17 - 4 = 13 apples
2. 23 + 49 = 72 bricks
3. 9 * 7 = 63 seats
4. 55 / 7 = about $7.85
5. 1/1.609 * 14 = 8.7mi
6. 2x + 6y = 256
x + y = 100
2x + 2y = 200
4y = 56
y = 14 fill-in-the-blank
x = 86 multiple choice
7. Does not change...
8. 52! = too much that you gotta do it yourself (about 8x10^67)
9. 10C3 = 120
10. 26P5 = 7893600
11. x < 80
if that condition is fulfilled then it the more gas you buy the cheaper it is
12. at 0h, speed is 1km/h
at 4h, speed is 16km/h
acceleration = (4-0)/(16-1) = 0.267 km/h^2 (3 s.f.)
13. Can't really understand the exact question of the position of the ladder but I'll draw it as:

.| .\
.| .\
5m .| .\ 17m
.| .\
.|_____\
v264
( this 'triangle' was better in my text box)
I'm not sure if I gotta use differentiation to do this but,
at 1s; 4.5m on a wall; v(17^2-4.5^2) = x
x - v264 = 0.146m/s (3 s.f.) this one's probably wrong

14. f(7) - f(5) = 436L = 436000ml
15. f(128) - f(32) = -0.155 dollars apparently (3s.f.)

I probably have to use differentiation for no. 13-15 but I'm too lazy so I just do the 'logical' way.


Not even gonna do the bonus ones...

 

[Thaus]

I would do it, but I have no TIME PLS.
PS
Answers:

I don''t think you actually wrote that lol.

 

[MrTokay]

I know, its a feat of extraordinary genius to make it say "MrTokay said ^" :p

 

[MagnificentSpam]

#15 -.155

How did you get that? Because I got something completely different, not sure if I did it right though.

 

[Ellie Williams]

Edit:

Spoiler: Bonus 1

(452 * 453) / 2 = 102378

So, did you read Carl Friedrich Gauss's biography?

 

[Nikboo]

Maths Revision! Yipeeeeee!
Whyy yu make me do dis!

Spoiler: #1

I have 17 apples. I eat 4 of them. How many do I have left?

17 - 4 = 13
ANS = 13

Spoiler: #2

Bob has 23 lego bricks. He receives 49 more of them. How many lego bricks does he have?

23 + 49 = 72
ANS = 72

Spoiler: #3

A theater has 9 rows of seats. Each row has 7 seats. How many seats are there?

9 x 7 = 63
ANS = 63

Spoiler: #4

Alice has $55. She plans to split them among 7 friends. How much money will she have left?
CLARIFICATION: Alice will keep the remainder. She is not among her 7 friends that she is splitting money to.

55 / 7 = 7 r. 6
ANS = 7

Spoiler: #5

If 1 mile equals 1.609 kilometers, how many miles are in 14 kilometers?

14 / 1.609 = 8.70 (ROUNDED TO 3 s.g.f)
ANS = 8.70 (ROUNDED TO 3 s.g.f)

Sorry, couldn't continue....

 

[MagnificentSpam]

So, did you read Carl Friedrich Gauss's biography?

I haven't yet, but I actually live in Braunschweig, where Gauß discovered this, so I've heard this story multiple times.

 

[Despacito 2]

Not that difficult ._.

 

[Earth]

(Pls it's weekend don't get us infected with math thanks in advance)

 

[Ellie Williams]

The answers have now been posted!

In the meantime, I have created another problem for you guys :cool:!

Spoiler: Trigonometry Problem

Last edited by Leonhard Euler, April 15, 1707​