Question

There are $20$ girls and $15$ boys in a class.
a) What is the ratio of the number of boys to the number of girls?
b) What is the ratio of the number of girls to the total number of students in the class?
c) What is the ratio of the number of boys to the total number of students in the class?

Answer 1

Total number of students in class $=20+15=35$

(a) The ratio of number of boys to the number of girls
$=15:20=\frac{15}{20}=\frac{3}{4}$
Hence, the ratio of the number of boys to the number of girls is $3:4$

(b) The ratio of number of girls to the total number of students
$=20:35=\frac{20}{35}=\frac{4}{7}$
The ratio of number of girls to the total number of students is $4:7$

(c) The ratio of number of boys to the total number of students
$=15:35=\frac{15}{35}=\frac{3}{7}$
The ratio of the number of boys to the total number of students is $3:7$