Question

A study of a population of 1,200 frogs revealed that 12 out of every 180 frogs in the population have spots on their back. Based on the results of this study, how many frogs in the population do NOT have spots on their back?

Answer 1

Answer: 1120

Explanation:

Given: Size of the population in the study = 1200

Also they revealed that 12 out of every 180 frogs in the population have spots on their back.

Thus we have fraction
`=(12)/(180)=(3)/(45)`

Hence,
`(3)/(45)` of total frogs have spots.

Now,
`(3)/(45)\ of\ 1200=(3)/(45)*1200=80`

Therefore, 80 out of 1200 frogs in the population have spots.

Thus, the number of frogs in the population do not have spots = 1200-80=1120