A biologist estimates that the human body contains 90 pounds of water for every 100 pounds of bod weight. At this rate, estimate the number of pounds of water in a child who weighs 80 pounds.

Question

it has to be a proportion

Answer 1

Hi Betty,

Yes, you want to set up a proportion ...

90 pounds of water/ 100 pounds of body weight = ?/80 pounds of body weight

Cross multiply to solve:)