Problema Solution
Fran has a recipe that calls for 1 1/2 cups of milk to make a dozen of cookies. How much milk would be needed to make 20 cookies?
Answer provided by our tutors
1 1/2 cups = (2*1 + 1)/2 = 3/2 cups
1 dozen = 12 cookies
let m = the milk needed for 20 cookies
12 : 3/2 = 20 : m
12 / (3/2) = 20 / m
by solving we find
m = 2.5 cups
m = 2 1/2 cups
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2 1/2 cups of milk is needed for 20 cookies.