Important Questions For CBSE Class 7 Maths Chapter 8
Important Questions For CBSE Class 7 Maths Chapter 8
Important Questions For CBSE Class 7 Maths Chapter 8
Maths
Chapter 8 – Comparing Quantities
600
600 g : 5000 g =
5000
6 3
50 25
Required ratio is 3: 25
2
2. Write as percent.
5
(a) 18 m to 45 cm
Ans: Let’s convert both lengths into same unit
1m 100 cm
18 m 18 100
1800 cm
20 days = 20 24
= 480 hours
8. In a city, 35% of population are males and 25% are females and remaining
are children. What is the percentage of children in the city?
Ans: The total percentage = 100
% of males = 35%
% of females = 25%
(100 35 25) %
100 60 %
40 %
9. Find:
25
3000
100
25 30
750
10. Convert given percent to decimal fractions and also to fractions in simplest
form
(a) 10%
Ans: To convert percent into decimal fraction we will divide the number by 100
(b) 40%
Ans: To convert percent into decimal fraction we will divide the number by 100
40 4
40% 0.4
100 10
11. Mithali buys a TV at 12,000 and sells it at a profit of 20%. How much
money she gets?
20
12, 000
100
20 120
Rs. 2400
12. Find
1
(a) 12 % of 75
2
1 25
Ans: We know, 12
2 2
Ans:
30
150
100
3 15
45
10 % of x 800
10 % x 800
10
x 800
100
1
x 800
10
x 800 10
x 8000
14. Manvita saves Rs. 9000 from her salary every month. If it is 5% of her
salary. Find her salary.
5% of x 9000
5
x 9000
100
9000 100
x
5
x 1800 100
x 1,80, 000
3
(a)
4
2
(b)
5
2 20 40
40 %
5 20 100
34
(a)
50
Ans: First, we will make denominator 100, and then we will convert that number
into percent
34 2 78
78%
50 2 100
1
(b)
4
1 25 25
Ans: 25%
4 25 100
(c) 0.03
3
Ans: 0.03 3%
100
17. Out of 24,000 voters in a constituency 48% voted. Find the no. of voters
who did not vote.
48
24, 000
100
48 240
11,520
No. of voters did not vote = Total voters – No. of voters voted
18. If Rs. 500 has to be divided among Mishala, Manvita and Meera in the
ratio 1:3:6. Then how much money will each get and what will be the
percentages.
Given, Rs. 500 has to be divided among Mishala, Manvita and Meera in the ratio
1 : 3 : 6.
Mishala’s share = x
Manvita’s share = 3x
Meera’s share = 6x
According to question
1
% 100 10%
10
3
% 100 30%
10
6
% 100 60%
10
19. Find the amount to be paid at the end of 4 years at each case
Ans: Given,
P 1500, R 8% PA , T 4 years
1500 8 4
I 15 8 4 Rs 480.
100
PRT 7500 5 4
Now, interest I= 75 5 4 Rs.1500
100 100
20. What rate gives an interest of Rs. 540 on a sum of Rs. 18000 in 3 years?
Time, T 3 years
Rate =
Interest ×100 540 100 180
1%
Principal× Time 18000 3 180