Question

In a school, out of 1220 students , 300 are girls.Find the ratio of :
(a) Number of girls to the total number of students.
(b) Number of boys to the number of girls.
(c) Number of boys to the total number of students.
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Answer 1

Total = 1220, Girls = 300, Boys = 1220-300 = 820

A. 51:61
B. 41:15
C. 61:61

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Answer 2

a) 15 : 61

b) 46 : 15

c) 46 : 61

Step-by-step explanation:

Given,

The total number of students in a school = 1220 and

The number of girls students in a school = 300

∴ The number of boys students in a school = The total number of students in a school - The number of girls students in a school

= 1220 - 300 = 920

a) The ratio of  number of girls to the total number of students

= 300 : 1220

Divided by 20, we get

= $\dfrac{300}{20}: \dfrac{1220}{20}$

= 15 : 61

b) The ratio of number of boys to the number of girls

= 920 : 300

Divided by 20, we get

= $\dfrac{920}{20} : \dfrac{300}{20}$

= 46 : 15

c)  The ratio of number of boys to the total number of students

= 920 : 1220

Divided by 20, we get

= $\dfrac{920}{20}:\dfrac{1220}{20}$

= 46 : 61