If a cat weighing 13 pounds has 75 fleas, how many fleas would a 20 pound cat have?

Question

Please include how you arrived at the answer using conversion factors

Answer 1

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.