Mrs. Fredrickson has 80 chickens where 1/4 are roosters and the rest are hens. Only three-fourths of those hens lay eggs. How many chickens does Mr. Fredrickson have that do not lay eggs?
Let’s work this out in a step by step way to be sure we have the right answer.
35
Mrs.

Fredrickson has 80 x 1 / 4 = 20 roosters.

So he has 80 - 20 = 60 hens.

Only 60 x 3 / 4 = 45 of the hens lay eggs.

Thus, 60 - 45 = 15 hens do not lay eggs.

Therefore, Mr.

Fredrickson has a total of 15 hens + 20 roosters = 35 chickens that do not lay eggs.

.

The final answer: 35