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 = $
<gadget id="calculator">10*3</gadget>
<output>30</output>
30 from three families.
The school band earned $15/family * 5 families = $
<gadget id="calculator">15*5</gadget>
<output>75</output>
75 from 15 families.
The school band earned $30 + $75 = $
<gadget id="calculator">30+75</gadget>
<output>105</output>
105 total.
The school band needs $150 - $105 = $
<gadget id="calculator">150-105</gadget>
<output>45</output>
45 more to reach their goal.

<result>45</result>