Question: Can you guide me through solving this problem: Walter bought 60 apples from the store. He ate 2/5 of them and gave his sister 25% of the remaining number. If he then sold the remaining apples to his uncle at $3 each, how much money did he receive?
Answer: 
From the 60 apples that Walter bought, he ate 2/5*60=24 apples
The number of apples remaining was 60-24=36
Walter gave 25/100*36=9 apples to his sister.
He remained with 36-9=27 apples.
He then sold the apples for 27*$3=$81 to his uncle.