# Ratio and Proportion Exercise I

Ques 1 Ratio & Proportion

If a : b = 2 : 3 and b : c = 5 : 7, find the value of a : b : c ?
a) 5 : 7 : 13
b) 10 : 15 : 17
c) 10 : 15 : 21
d) 7 : 15 : 13

c is the correct option

Ques 2 Ratio & Proportion

What is the fourth proportional to 3, 7, 15.?
a) 15
b) 25
c) 30
d) 35

d is the correct option

Ques 3 Ratio & Proportion

What is the fourth proportional to 3, 7, 15.?
a) 2
b) 4
c) 16
d) 32

c is the correct option

Ques 4 Ratio & Proportion

Find the fourth proportion of 12,16,18?
a) 22
b) 24
c) 28
d) 30

b is the correct option

Ques 5 Ratio & Proportion

Find the third proportion of 18,36?
a) 22
b) 24
c) 48
d) 72

d is the correct option

Ques 6 Ratio & Proportion

There are 450 students in a school and there are two sections A & B in the school. There are three streams in each section i.e., Art, Science & Commerce. (75/4)% of total students in A are in Commerce and (200/7)% of total students in B are in Science. Sum of total students in Commerce in A & total students in Science in B is 105. (400/21)% of total students in B are in Commerce and 50% of total students in A are in Art.

Find the ratio of total students in Commerce in B to total students in Science in A?
a) 8 : 15
b) 8 : 17
c) 8 : 13
d) 8 : 11

is the correct option