A recipe will make 10 pancakes that are 8 inches in diameter. If you decide to

make 4 inch diameter pancakes, how many of the smaller pancakes would this

recipe make?

its not 20!

10 pancakes produces 8 inches in diameter.

The area of 1 pancake is

Area = pi * r^2

Area = pi * 4^2

Area = 50.27 in^2

Then multiply it by 10

Total area = 502.65 in^2

A smaller pancake

Area = pi * r^2

Area = pi * 2^2

Area = 12.56 in^2

Divide 502.65 by 12.56

= 502.65 / 12.65

= 39.74

So there are 39 pancakes.