Will had some blueberry scones and strawberry scones. He gave away 90 scones to his cousin. 20% of them were blueberry scones and the rest were strawberry scones.

1. How many strawberry scones did he give his cousin?
2. Will gave some blueberry scones to his sister. ³₇ of all the scones he gave away to his cousin and his sister were blueberry scones. How many blueberry scones did he give his sister?

(a)
Percentage of strawberry scones
= 100% - 20%
= 80%

Number of strawberry scones that Will gave to his cousin
= 80% x 90
= ⁸⁰₁₀₀ x 90
= 72 

(b)
Fraction of all the scones he gave away to his cousin and his sister that were strawberry scones
= 1 - ³₇
= ⁴₇

4 u = 72

1 u = 72 ÷ 4 = 18

Number of blueberry scones that Will gave to his cousin and his sister
= 3 u
= 3 x 18
= 54

Number of blueberry scones that Will gave to his cousin
= 90 - 72
= 18

Number of blueberry scones that Will gave to his sister
= 54 - 18
= 36

Answer(s): (a) 72; (b) 36