Question

A crack in a water tank leaks 7 gallons of water each hour . After 9 hours , what is the change in the volume of water in the tank due to the leak

Answer 1

-63 gallons

Explanation:

You don't know the original water amount, but it is asking for the change or the difference in the water volume so it doesn't even matter.

Since 7 gallons leak every hour and it is over 9 hours, you can multiply 9 by 7 to get 63 gallons.