Question

The amount of water used to take a shower is directly proportional to the amount of time that the shower is in use. A shower lasting 15 min requires 9 gallons of water. Find the amount of water used in a shower lasting 10 minutes.

Answer 1

so you have a direct variation equation

g = kt

g = galloons used t = time taken

so you need to find k, the variation coefficient

so using the know information

9 = k*15

solve for k...