Practice D1 D2 D3 D4 D5 D6 D7 D8 D9

Practice D8

A mathematics class has 12 boys and 18 girls.

a) 50% of the boys wear glasses.
How many boys wear glasses?

b) It is known that 50% of the girls have long hair.
How many girls have long hair?

c) 60% of all the students wear glasses.
How many of all the students wear glasses?