Question

Brian is sanatizing his pool and hot tub with a bag of 63 oz powdered sanatizer. If he used 1/3 of the bag on his pool and 1/7 of the bag on his hot tub how much is left in the bag?

Answer 1

33 oz

Explanation:

63x1/3=21

63x1/7=9

21+9=30

63-30=33

33 oz of powdered sanitizer is left in the bag.

I took 1/3 of 63 first, to show how much he used on the pool. Then I took 1/7 of 63 to show how much he used on the hot tub. I added the amount he used, and subtracted them from 63 to see how much was left. He had 33 oz left in the bag. Hope this helps! Good luck! :)