Jeremy had some chocolate chip biscuits and apricot biscuits. He gave away 84 biscuits to his brother. 25% of them were chocolate chip biscuits and the rest were apricot biscuits.

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

(a)
Percentage of apricot biscuits
= 100% - 25%
= 75%

Number of apricot biscuits that Jeremy gave to his brother
= 75% x 84
= ⁷⁵₁₀₀ x 84
= 63 

(b)
Fraction of all the biscuits he gave away to his brother and his cousin that were apricot biscuits
= 1 - ²₅
= ³₅

3 u = 63

1 u = 63 ÷ 3 = 21

Number of chocolate chip biscuits that Jeremy gave to his brother and his cousin
= 2 u
= 2 x 21
= 42

Number of chocolate chip biscuits that Jeremy gave to his brother
= 84 - 63
= 21

Number of chocolate chip biscuits that Jeremy gave to his cousin
= 42 - 21
= 21

Answer(s): (a) 63; (b) 21