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Ncert Solutions for comparing quantities Class 8 maths Chapter 8 CBSE Part 1



In this page we have NCERT book Solutions for Class 8 Maths Chapter 8:comparing quantities for EXERCISE 1 . Hope you like them and do not forget to like , social share and comment at the end of the page.
Question 1
 Find the ratio of the following.
(a) Speed of a cycle 15 km per hour to the speed of scooter 30 km per hour.
(b) 5 m to 10 km
(c) 50 paise to Rs 5
Answer
a)
Required ratio =15/30 =1/2 =1:2
b) Require ratio =5m/10 km
=5m/10×1000m= 1/2000 = 1:2000
c)
Require ratio =50paise/Rs 5
=50paise/500 paise= 1/10 = 1:10
Question 2
 Convert the following ratios to percentages.
(a) 3 : 4
(b) 2 : 3
Answer:
1) 3:4 =3/4
% can be find by multiplying 100
So %= (¾)× 100=  75%
2) 2:3 =2/3
% can be find by multiplying 100
So %= (2/3)× 100=  (200/3)%
Question 3
 72% of 25 students are good in mathematics. How many are not good in mathematics?
Answer
Percentage of Students not good in math = 100 - 72 = 28
So No of students not good in Mathematics
=28% of 25 = 28×(25/100)= 7
Question 4
 A football team won 10 matches out of the total number of matches they played. If their win percentage was 40, then how many matches did they play in all?
Answer
Let us assume total number of matches = y
Then % of matches win=  (10/y)× 100
Now it is given % of matches win=40
So
40=(10/y)× 100
y=(10/40) ×100 =25
Question 5
 If Chameli had Rs 600 left after spending 75% of her money, how much did she have in the beginning?
Answer: Money left after spending 75% = 100-75 = 25%
Let us assume total money = y
Then 25% of y =600
25 ×(y/100)=600
y=2400
Chameli had Rs. 2,400 in the beginning
Question 6
 If 60% people in a city like cricket, 30% like football and the remaining like other games, then what per cent of the people like other games? If the total number of people are 50 lakh, find the exact number who like each type of game.
Answer
% of Cricket Fans = 60%
% of Football Fans = 30%
So, Other Sports’ Fans = 100 - (60 + 30) = 10% people like other games.
Now it is given total number of population is 50 Lakh= 50,00,000
So Number of  cricket fan
=50,00,000 ×( 60/100) =30,00,000= 30 Lakh
So Number of  Football fan
=50,00,000 ×( 30/100) =15,00,000= 15 Lakh
So Number of  other games fan
=50,00,000 ×( 10/100) =5,00,000= 5 Lakh

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