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? pennies ExRenation Check
Solution
Step 1 ：Set up the equation: \(\frac{3}{10}x + 240 = \frac{4}{5}x\)
Step 2 ：Solve for x: \(x = \boxed{480}\)
