Question

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

Answer 1

72 lb

Explanation:

Write and solve an equation of ratios:

80 pounds x

----------------- = ------------------

100 pounds 90 pounds

Cross multiplying, we get (100 pounds)x = 7200, or x = 72 pounds.

The 80 pound child's weight includes 72 pounds of water.