Jeremy had some strawberry wafers and chocolate chip wafers. He gave away 80 wafers to his cousin. 25% of them were strawberry wafers and the rest were chocolate chip wafers.

1. How many chocolate chip wafers did he give his cousin?
2. Jeremy gave some strawberry wafers to his sister. ²₅ of all the wafers he gave away to his cousin and his sister were strawberry wafers. How many strawberry wafers did he give his sister?

(a)
Percentage of chocolate chip wafers
= 100% - 25%
= 75%

Number of chocolate chip wafers that Jeremy gave to his cousin
= 75% x 80
= ⁷⁵₁₀₀ x 80
= 60 

(b)
Fraction of all the wafers he gave away to his cousin and his sister that were chocolate chip wafers
= 1 - ²₅
= ³₅

3 u = 60

1 u = 60 ÷ 3 = 20

Number of strawberry wafers that Jeremy gave to his cousin and his sister
= 2 u
= 2 x 20
= 40

Number of strawberry wafers that Jeremy gave to his cousin
= 80 - 60
= 20

Number of strawberry wafers that Jeremy gave to his sister
= 40 - 20
= 20

Answer(s): (a) 60; (b) 20