Question

Kaitlyn's penny bank is 1/5 full. After she adds 520 pennies, it is 7/10 full. How many pennies can Kaitlyn's bank hold?

Answer 1

1/5 = 20%

Answer 2

7/10= 70%

Answer 3

what do you think?

Answer 4

This is the worst thing in the world for me lol is it 720? @beccaboo333

Answer 5

I wonder if @SolomonZelman could set it up lol

Answer 6

I don't know how to set it up to solve it, fractions and percentages are my enemy

Answer 7

Ok, so lets recall the question

Kaitlyn's penny bank is 1/5 full. After she adds 520 pennies, it is 7/10 full. How many pennies can Kaitlyn's bank hold?

\[so~~~~~\frac{1}{5}x+520=\frac{7}{10}x\]\[\frac{2}{10}x+520=\frac{7}{10}x\]\[520=\frac{5}{10}x\]\[520=1/2x\]

So we see that 520 pennies is a half of the bank, so the full bank would be 1040

Answer 8

How does 7/10 go to 5/10? Like what chaanged it to that?

Answer 9

i was right @HaileyHeyDo when i said 1040 before and deleted lol

Answer 10

@beccaboo333 thank you!

Answer 11

dont forget to thank @SolomonZelman

Answer 12

I forgot to tag him! @SolomonZelman

Answer 13

Anytime guys!

Answer 14

\(\huge\color{yellow}{\huge {\bbox[5pt,magenta,border:2px solid blue]{~•~~‿~•~}}}\)

Answer 15

I have another one but when I answered it with what I thought for sure was right it was wrong. :( A water container is 3/8 full. After pouring 6 gallons of water in it, it's 3/4 full. How many gallons can it hold? I thought it was 12?

Answer 16

@SolomonZelman

Answer 17

Yes?

Answer 18

Can you tell me where I went wrong on that one above? I just typed it @SolomonZelman

Answer 19

is it 8?

Answer 20

Do you see how I did it before with the previous question?

Do this one the same exact way, I'll help you make the equation,
\[\huge\color{red}{\frac{3}{8}x+6=\frac{3}{4}x}\]

Answer 21

and yes 8 is right, I got disconnected right before posting a reply again...

Answer 22

just refer to @beccaboo333 she is very intelligent