ML Aggarwal Class 7 Solutions Chapter 7 Percentage and Its Applications Ex 7.2 for ICSE Understanding Mathematics acts as the best resource during your learning and helps you score well in your exams.

## ML Aggarwal Class 7 Solutions for ICSE Maths Chapter 7 Percentage and Its Applications Ex 7.2

Question 1.

Find:

(i) 15% of 250

(ii) 25% of 120 litres

(iii) 1% of 1 hour

(iv) 75% of 1 kg

(v) 120% of ₹ 250

(vi) 0.6% of 2 km

Solution:

Question 2.

8% of children of a class of 25 like getting wet in the rain. How many children like getting wet in the rain?

Solution:

Question 3.

Vasundhara ate 3 ice cream cups out of 20 kept in the fridge. What per cent did she eat?

Solution:

Question 4.

Express:

(i) 20 as a percentage of 50

(ii) 60 litres as a percentage of 40 litres

(iii) 90 cm as a percentage of 4.5 m

(iv) 350 g as a percentage of 5.6 kg

Solution:

Question 5.

What per cent is:

(i) 12 of 80

(ii) 25 paise of 4 rupees

(iii) 300 g of 2 kg

Solution:

Question 6.

A school team won 6 games this year against 4 games won last year. What is the per cent increase?

Solution:

Question 7.

The price of a shirt decreased from ₹ 80 to ₹ 60, find the percentage of decrease in the price of the shirt.

Solution:

Question 8.

My mother says, in her childhood petrol was ₹ 1 per litre. It is ₹ 65 per litre today. By what percentage has the prices of petrol gone up?

Solution:

Question 9.

Rate of basmati rice last year was ₹ 40 a kg. This year they are costly by 20%. What is the price this year?

Solution:

Question 10.

300 students took an exam. 28% failed. Calculate the number of students who passed the exam.

Solution:

Question 11.

Out of 15000 voters in a constituency, 60% voted. Find the number of voters who did not vote.

Solution:

Question 12.

20% of the length of a flagpole is painted green, 45% is painted yellow and the remaining red. If the length of the pole is 18 m, what length of it is painted red?

Solution:

Question 13.

Chalk contains 10% calcium, 3% carbon, 12% oxygen and the remaining sand. Find the amount of carbon and calcium (in grams) in 2\(\frac { 1 }{ 2 }\) kg of chalk. Also, find the amount of sand (in kg).

Solution:

Question 14.

Find the whole quantity if:

(i) 25% of it is 9

(ii) 75% of it is 15

(iii) 12% of it is ₹ 1080

(iv) 8% of it is 40 litres

Solution:

Question 15.

Mohini saves ₹ 400 from her salary. If this is 10% of her salary, then what is her salary?

Solution:

Question 16.

16% of the apples in a basket go bad. If there are 42 good apples in the basket, find the total number of apples in the basket.

Solution:

Question 17.

In an examination, a student has to secure 45% marks to pass the exam. If Varun got 251 marks and failed by 19 marks, what are the maximum marks?

Solution:

Question 18.

On a rainy day, 94% of the students were students absent on that day was 174, find the total strength of the school.

Solution:

Question 19.

40% of the population of a town are men and 39% are women. If the number of children is 12600, find the number of men.

Solutions:

Question 20.

If the price of a watch is increased by 15%, the increase in the price is ₹ 90. What was the price of watching earlier?

Solution:

Question 21.

(i) Find the number which when increased by 30% becomes 39.

(ii) Find the number which when decreased by 8% becomes 506.

Solution:

Question 22.

The price of a shirt is reduced by 7% to ₹ 465. What is its original price?

Solution: