# Class 7 Maths NCERT Solutions for Chapter – 8 Comparing Quantities Ex – 8.1

## Comparing Quantities

Question 1.
Find the ratio of :
(a)
₹5 to 50 paise
(b) 15 kg to 210 kg
(c) 9 m to 27 cm
(d) 30 days to 36 hours

Solution:

Question 2.
In a computer lab, there are 3 computers for every 6 students. How many computers are needed for 24 students?

Solution:
In a computer lab,
Every 6 students need 3 computers.
∴ Every 1 student needs $\frac { 3 }{ 6 }$ computers.
∴ Every 24 students need $\frac { 3 }{ 6 }$ × 24 = 3 × 4 = 12 computers

Question 3.
Population of Rajasthan = 570 lakhs and population of U.P. = 1660lakhs. Area of Rajasthan = 3 lakh km2 and area of U.P. = 2 lakh km2.
(i)
How many people are there per km2 in both these states?
(ii) Which state is less populated?

Solution: