Question

You use 4 gallons of water on 30 plants in your garden. At that rate, how much water will it take to water 45 plants?

Answer 1

It will take 6 gallons of water.

4÷2=2
30÷2=15
(every 15 plants you'll use 2 gallons)
15•3=45
2•3=6 gallons

Answer 2

Write a proportion like so:

4 gallons/30 plants= x gallons/45 plants

Cross multiply to find the value of x
4*45= 180
180/30= 6=x

Final answer: 6 gallons