Correct Answers: | |

Wrong Answers: | |

Unattempted: |

### Question 1

The average age of three friends 3 years ago was 31 years. The average age of two them 5 years ago was 12 years. What is the present age of the third friend?

**A**

68 years.

**B**

69 years.

**C**

67 years.

**D**

66 years.

**Soln.**

**Ans: a**

Let the present ages of the three friends be a, b and c. We are given ${(b - 5) + (c - 5)}/2$ = 12. Which gives b + c = 34. We are also given ${(a - 3) + (b - 3) + (c - 3)}/3$ = 31, which gives a + b + c = 3 * 31 + 9 = 102. Putting b + c here we get a = 102 - (b + c) = 102 - 34 = 68 years.

### Question 2

What is the average of first 383 natural numbers?

### Question 3

Average marks of class of 10 students is 62. What will be the average if each student is given 8 as grace marks?

**A**

70.

**B**

71.

**C**

69.

**D**

68.

**Soln.**

**Ans: a**

Let the total score of the class before grace marks be x. Then, by average formula $62 = x/10$, which gives x = $62 × 10 = 620$. When grace marks = 8 are added for each of the 10 students, the new total becomes $620 + 10 × 8 = 700$, the new average becomes $700/10 = 70$. TIP: As a shortcut, the new average = old average + grace marks.

### Question 4

412 men and 103 women are employed in a farm. The average wage per person is Rs. 194. What is the wage of a man if women are paid Rs. 5 less?

### Question 5

154 men and 616 women are employed in a farm. The average wage per person is Rs. 141. What is the wage of a man if women are paid Rs. 5 less?

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This Blog Post/Article "Averages Quiz Set 002" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Updated on 2017-04-07.