Maya's penny bank is 3/10

full. After she adds 520

pennies, it is

4/5 full. How many pennies can Maya's bank hold?

Okay. so the answer seems really hard to get to, but its actually very easy. the answer is 1040. we know her bank is 3/10 full. and when she adds 520 to it. it is 4/5's full. but remember, we can break it down to 8/10, and the difference is 5/10, which is 1/2. So ... if 520 is equal to 1/2, then 2/2 is equal to 1040.