RS Aggarwal Class 7 Math Tenth Chapter Percentage Exercise 10C Solution

RS Aggarwal Class 7 Math Tenth Chapter Percentage Exercise 10C Solution

EXERCISE 10C

OBJECTIVE QUESTIONS

Mark (√) against the correct answer in each of the following:

(1) 3/4 as rate per cent is

(2) The ratio 2 : 5 as rate per cent is

Ans: (c)

(4) If x% of 75 = 9, then the value of x is

Ans: (c)

(5) What per cent of 2/7 is 1/35?

Ans: (d)

Let the required percent be x.

(6) What per cent of 1 day is 36 minutes?

Ans: (b)

(7) A number increased by 20% gives 42. The number is

Ans: (a)

(8) A number decreased by 8% gives 69. The number is

Ans: (b)

(9) An ore contains 5% copper. How much ore is required to obtain 400 g of copper?

Ans: (d)

Let amount of copper is x.

(10) After deducting a commission of 10% a TV costs Rs 18000. What is its gross value?

Ans: (b)

Solution: Let the grass value be x.

Percentage of deducting commission = 10%

Percentage of mode commission = (100 – 10) = 90%

(11) On increasing the salary of a man by 25%, it becomes Rs 20000. What was his original salary?

Ans: (b)

(12) In an examination, 95% of the total examinees passed. If the number of failures is 28, how many examinees were there?

Ans: (c)

(13) A fruit-seller had some apples. He sells 40% of them and still has 420 apples. How many apples had he in all?

Ans: (c)

(14) The value of a machine depreciates 10% annually. If its present value is Rs 25000, what will be its value after 1 year?

Ans: (b)

(15) 8% of a number is 6. What is the number?    

Ans: (c)

(16) 60% of 450 =?

Ans: (c)

60% of 450 = 450 × 60/100 = 270

(17) On reducing the value of a chair by 6% it becomes Rs 658. The original value of the chair is

Ans: (d)

(18) 70% of students in a school are boys. If the number of girls is 240, how many boys are there in the school?

Ans: (b)

Let the total number of student be x

Therefore, the number of boys = (800 – 240) = 560.

(19) If 11% of a number exceeds 7% of the number by 18, the number is

Ans: (c)

Let the number be x

(20) If 35% of a number added to 39 is the number itself, the number is

Ans: (a)

Let the number be x.

(21) In an examination it is required to get 36% to pass. A student gets 145 marks and fails by 35 marks. The maximum marks are

Ans: (c)

Let the total marks be x

(22) A number decreased by 40% gives 135. The number is

Ans: (d)