The school band is having a car wash to raise money. Their goal is to collect $150. So far they have earned $10 each from three families and $5 each from 15 families. How much more money do they have to earn to reach their goal?
The school band earned $10/family * 3 families = $<T>multiply(10, 3)=30 from three families.
The school band earned $15/family * 5 families = $<T>multiply(15, 5)=75 from 15 families.
The school band earned $30 + $75 = $<T>add(30, 75)=105 total.
The school band needs $150 - $105 = $<T>subtract(150, 105)=45 more to reach their goal.
