Page 113 - ICSE Math 7

2. Find x for each of the following.
(a) 15% of ` 100 = x (b) 20% of 200 kg = x

(c) 25% of x = 50 (d) x% of 700 = 350

PRACTICE TIME

1. Aman’s annual salary is ` 86,600. His salary is increased by 9%. Find his new salary.
2. Two years ago, Saloni’s height was 155 cm. If her height has increased by 6%, how tall is she now?

3. If 45% of a quantity is 189, find the quantity.
4. The population of a city has increased by 8%. If it was 76,000 earlier, what is it now?
5. To pass in an exam, a student has to score 40% of the maximum marks. If Raj scores
128 marks and fails by 8 marks, find the maximum marks.

6. The price of a bicycle is ` 55,800, while initially it was ` 60,000. Find the percentage decrease
in the price.
7. Sumit scored 54 marks in an exam, which were wrongly recorded as 45 marks. Find the error per cent.
8. A shopkeeper sold pencils worth ` 450 in a day, which was 30% of his total sales. Find his total
sales for that day.
9. Mohit got 50 marks out of 60 in English, 40 out of 50 in Hindi and 80 out of 100 in Mathematics.
In which subject has he scored the highest percentage?
10. Mr Sharma divided ` 80,000 among his wife and two daughters. His wife got 40% of the total
amount, elder daughter got 60% of the remaining amount and the rest was given to the younger
daughter. Find the share of each of them.

11. The profit of a factory is 20% more this year than last year. If this year profit is ` 24,000, what
was last years’s profit?

12. Arsh bought a car and spent 15% of the cost on repairs. If his total cost including the repairs was
` 74,750, at what price did he buy the car?
13. On first day, Seema reads 10% of a book which has 300 pages. Next day she read 60 pages. Find
the percentage of pages which are unread.
14. A pizza weighs 1.8 kg. It is cut into two parts so that the first part is 25% heavier than the second
part. Find the weight of each part.
15. The monthly rent Mr Verma pays is ` 25,000. If the rent increases by 20%, then what will be the
new rent pay by him?

THINK SMART

1. A number is first increased by 20% and then decreased by 15%. Find the increase or decrease in
the percentage on whole.
2. In a food festival, there are 2,500 people. The ratio of adults to children is 4 : 1. If every 3 adults
out of 5 are females, find the total percentage of males and children.
3. In an election, 10% of the total votes were declared invalid. The winner of the election gots 40%
of the total valid votes. If the total votes polled were 6,00,000, find the number of valid votes
polled in favour of the candidate.

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