Problem

Salma's penny bank is $\frac{3}{10}$ full. After she adds 240 pennies, it is $\frac{4}{5}$ full. How many pennies can Salma's bank hold?
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Answer

Solve for x: $x = 480$

Steps

Step 1 ：Set up the equation: $\frac{3}{10} x + 240 = \frac{4}{5} x$

Step 2 ：Solve for x: $x = 480$

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