Warren had some chocolate chip doughnuts and cherry doughnuts. He gave away 200 doughnuts to his brother. 40% of them were chocolate chip doughnuts and the rest were cherry doughnuts.

1. How many cherry doughnuts did he give his brother?
2. Warren gave some chocolate chip doughnuts to his sister. ⁴₇ of all the doughnuts he gave away to his brother and his sister were chocolate chip doughnuts. How many chocolate chip doughnuts did he give his sister?

(a)
Percentage of cherry doughnuts
= 100% - 40%
= 60%

Number of cherry doughnuts that Warren gave to his brother
= 60% x 200
= ⁶⁰₁₀₀ x 200
= 120 

(b)
Fraction of all the doughnuts he gave away to his brother and his sister that were cherry doughnuts
= 1 - ⁴₇
= ³₇

3 u = 120

1 u = 120 ÷ 3 = 40

Number of chocolate chip doughnuts that Warren gave to his brother and his sister
= 4 u
= 4 x 40
= 160

Number of chocolate chip doughnuts that Warren gave to his brother
= 200 - 120
= 80

Number of chocolate chip doughnuts that Warren gave to his sister
= 160 - 80
= 80

Answer(s): (a) 120; (b) 80