
Andrew M. answered 10/25/16
Tutor
New to Wyzant
Mathematics - Algebra a Specialty / F.I.T. Grad - B.S. w/Honors
You set up a proportion:
13 is to 75 AS 20 is to x
This is written as:
13/75 = 20/x Solve for x
Cross multiply
13x = 20(75)
x = 20(75)/13 = 115.384
Our estimation would be the 20 pound cat should
have approximately 115 fleas.