Question

(1) In a class of 50 students, 20% have black hair, 10% have blonde hair, and 70% has brown hair, calculate the number of students with the following hair colour;

(a) black hair
(b) blonde hair
(c) brown hair,

Answer 1

10,5,35

Explanation:

20% of 50=

0.2 x 50=

10

so 10 students have black hair

10% of 50=

0.1 x 50=

5

so 5 students have blonde hair

70% of 50=

0.7 x 50=

35

so 35 students have brown hair

Answer 2

(50 / 10) x 2 = 10 students have black hair
(50 / 10) x 1 = 5 students have blonde hair
(50 / 10) x 7 = 35 students have brown hair