Julian had some strawberry cookies and blueberry cookies. He gave away 80 cookies to his brother. 40% of them were strawberry cookies and the rest were blueberry cookies.

1. How many blueberry cookies did he give his brother?
2. Julian gave some strawberry cookies to his sister. ³₅ of all the cookies he gave away to his brother and his sister were strawberry cookies. How many strawberry cookies did he give his sister?

(a)
Percentage of blueberry cookies
= 100% - 40%
= 60%

Number of blueberry cookies that Julian gave to his brother
= 60% x 80
= ⁶⁰₁₀₀ x 80
= 48 

(b)
Fraction of all the cookies he gave away to his brother and his sister that were blueberry cookies
= 1 - ³₅
= ²₅

2 u = 48

1 u = 48 ÷ 2 = 24

Number of strawberry cookies that Julian gave to his brother and his sister
= 3 u
= 3 x 24
= 72

Number of strawberry cookies that Julian gave to his brother
= 80 - 48
= 32

Number of strawberry cookies that Julian gave to his sister
= 72 - 32
= 40

Answer(s): (a) 48; (b) 40