Mary earns $20 washing cars and $40 walking dogs each month. If she puts half of that money away each month how long would it take her to save $150?
Each month she makes 20+40=$<T>add(20, 40)=60
Every month she saves 60/2=$<T>divide(60, 2)=30.0
To save $150 it will take her 150/30=<T>divide(150, 30)=5.0 months
