In this section of maths the students get step by step RS Aggarwal Class 7 Chapter 10 Exercise 10B Solution.
RS Aggarwal Class 7 Ex. 10b Solution
RS Aggarwal Class 7 Maths Solution
1: Rupesh secures 495 marks out 750 in his annual examination. Find the percentage of marks obtained by him.
2: The monthly salary of a typist is Rs. 15625. If he gets an increase of 12%. Find his new salary.
3: The excise duty on a certain item has been reduced to Rs. 760 from Rs. 950. Find the reduction per cent in the excise duty on that item.
4: 96% of the cost of a TV is Rs. 10464. What is its total cost?
5: 70% of the students in a school are boys and the number of girls is 504. Find the number of boys in the school.
6: An ore contain 12% of copper. How many kilograms of the ore are required to get 69 kg of copper.
7: 36% of the maximum marks is required to pass test. A student gets 123 marks and is declared fail by 39 marks. Find the maximum marks.
8: A fruit-seller had some apples. He sells 40% of them and still has 420 apples. Find the number of apples he had originally.
9: In an examination, 72% of the total examinees passed. If the number of failures is 392, find the total number of examinees.
10: After deducting a commission of 5%, a moped costs Rs. 15200, What is its gross value?
11: Gunpowder contains 75% of nitre and 10% of sulphur, and the rest of it is charcoal. Find the amount of charcoal in 8 kg of gunpowder.
12: Chalk contains 3% of carbon, 10% of calcium and 12% of oxygen, Find the amount in grams of each of these substances in 1 kg of chalk.
13: Sonal went to school for 219 days in a full year. If her attendance is 75%, find the number of days on which the school was open.
14: 3% commission on the sale of a property amounts to Rs. 42660. What is the total value of the property?
15: In an election, there were two candidates A and B. The total number of voters in this constituency was 60000 and 80% of the total votes were polled. If 60% of the polled votes were cast in favour of A, how many votes were received by B?
16: The price of a shirt is reduced by 12% in a discount sale. If its present price is Rs. 1188, find its original price.
17: The price of a sweater is increased by 8%. If its increased price is Rs. 1566, find the original price.
18: After spending 80% of his income and giving 10% of the remainder in a charity, a man has Rs. 46260 left with him. Find his income.
19: A number is increased by 20% and the increased number is decreased by 20%, find the net increase or decrease per cent.
20: The salary of an officer in increase by 20%, by what percentage should the new salary be reduced to restore the original salary?
21: A property dealer charges commission at the rate of 2% on the first Rs. 200000. 1% on the next Rs. 200000 and 0.5% on the remaining price. Find his commission on the property that has been sold for Rs. 540000.
22: Nikhil’s income is 20% less than that of Akhil. How much per cent is Akhil’s income more than that of Nikhil’s?
23: John’s income is 20% more than that of Mr. Thomas. How much per cent is the income of Mr. Thomas less than that of John?
24: The value of a machine depreciate 10% every year. If it’s present value is Rs. 387000, What was its value in 1 year ago?
25: The value of a car decrease annually by 20%. If the present value of the car be Rs. 450000, what will be its value after 2 years?
26: The population of a town increase 10% annually. If its present population is 60000, what will be population after 2 years?
27: Due to an increase in the price of sugar by 25%, by how much per cent must a householder decrease the consumption of sugar so that there is no increase in the expenditure on sugar?
