Question

"Heavy Water" is a name given to a compound used in some nuclear reactors. Heavy water costs about $1,500 per gallon. If a nuclear plant spent $10,500 on heavy water, how many gallons of water were bought?

Answer 1

7 gallons of water were bought

Explanation:

This question can be solved using a rule of three.

One gallon costs $1,500. How many gallons cost $10,500?

1 gallon - $1,500

x gallons - $10,500

`1500x = 10500`

`x = (10500)/(1500)`

`x = 7`

7 gallons of water were bought