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### Question 1

There are three sections in school with 40, 40 and 40 students respectively. The average weight of a student in these sections, respectively, is 3, 3 and 2 Kg. What is the average weight of all the the students of the combined sections?

### Question 2

The average number of visitors at a zoo on a Monday is 156, whereas it is 162 on other days of the week. What will be the average number of visitors in a 30-day month that begins on a Monday?

### Question 3

Average marks of class of 28 students is 51. What will be the average if each student is given 7 as grace marks?

**A**

58.

**B**

59.

**C**

57.

**D**

56.

**Soln.**

**Ans: a**

Let the total score of the class before grace marks be x. Then, by average formula $51 = x/28$, which gives x = $51 × 28 = 1428$. When grace marks = 7 are added for each of the 28 students, the new total becomes $1428 + 28 × 7 = 1624$, the new average becomes $1624/28 = 58$. TIP: As a shortcut, the new average = old average + grace marks.

### Question 4

A, B and C are three numbers. The average of A, B and C is 25. The average of A and B is 14, and the average of B and C is 49, what is the value of number B?

### Question 5

What is the increase in the average of 10 numbers if the number 5 is replaced by 85?

### More Chapters | See All...

Distance and Time | Problems on Trains | Ranking Test | Pipes and Cisterns | Surds and Indices | Percentages | Cubes and Dice | Boats and Streams | Decimal Numbers | Compound Interest | More...

This Blog Post/Article "Averages Quiz Set 019" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Updated on 2017-04-07.