New Learning Composite Mathematics Class 7 SK Gupta Anubhuti Gangal Percentage and Its Applications Chapter 8F Solution

New Learning Composite Mathematics SK Gupta Anubhuti Gangal Class 7 Percentage and Its Applications Self Practice 8F Solution

(1) 55 per cent of the students in a school are girls. What percentage of the students are boys? Find the number of students, if there are 216 boys.

(2) If 10% is deducted from a bill, Rs. 7200 remains to be paid. How much is the bill?

Solution:

(3) Calculation gives the length of a line segment as 6.4 cm, while from drawing and measurement it is obtained as 6.6 cm. Find the error per cent.

(4) Atul deposited 30% of his income in a bank. After spending 50% of the remaining, he had Rs. 10,500 left with him. What is his income?

Solution:

(5) Manish obtained 498 marks out of 600 marks and Aravind scored 640 marks out of 800 marks. Whose performance is better?

(6) In a graduate class of 200, 40% are women and 1/5 becomes lecturers. If the number of men who became lecturers is twice that of women, calculate approximate percentage of men who became lecturers.

Solution:

(7) The price of an article is reduced by 25%. In order to retain the original price, by what percentage should the present price be increased?

(8) In a mixture of milk and water, the proportion of water by weight is 75%. If in the 60 g mixture, 15 g of water is added, what would be the percentage of water?

Solution:

(9) One litre of water is evaporated from a 6 litre solution containing 4% sugar. Find the percentage of sugar in the remaining solution.

(10) State Electricity Board gives 15% discount on electricity bills, if it is paid before due date. A person gets Rs. 54 as discount. What was the actual amount of the bill?

Solution:


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