Math
posted by Cherie on .
Uncle Ritchie has some $10 bills in his wallet. He shares all of them equally among his 4 nieces and nephews. Each of the nieces and nephews then donates two $10 bills to charity. They then each have five $10 bills.
How many $10 bills did Uncle Ritchie have in his wallet?
a) write an equation to solve this problem.
b) solve the equation.

4 * 7 = x
28 = x