Question

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!

Answer 1

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.