Owen had some vanilla wafers and strawberry wafers. He gave away 160 wafers to his sister. 25% of them were vanilla wafers and the rest were strawberry wafers.

1. How many strawberry wafers did he give his sister?
2. Owen gave some vanilla wafers to his cousin. ³₅ of all the wafers he gave away to his sister and his cousin were vanilla wafers. How many vanilla wafers did he give his cousin?

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

Number of strawberry wafers that Owen gave to his sister
= 75% x 160
= ⁷⁵₁₀₀ x 160
= 120 

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

2 u = 120

1 u = 120 ÷ 2 = 60

Number of vanilla wafers that Owen gave to his sister and his cousin
= 3 u
= 3 x 60
= 180

Number of vanilla wafers that Owen gave to his sister
= 160 - 120
= 40

Number of vanilla wafers that Owen gave to his cousin
= 180 - 40
= 140

Answer(s): (a) 120; (b) 140