# Quiz Discussion

The average age of 30 students is 9 years. If the age of their teacher is included, the average age becomes 10 years. The age of the teacher (in years) is :

Course Name: Quantitative Aptitude

• 1] 27
• 2] 31
• 3] 35
• 4] 40
##### Solution
No Solution Present Yet

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# Quiz
1
Discuss

After replacing an old member by a new member, it was found that the average age of five members of a club is the same as it was 3 years ago. What is the difference between the ages of the replaced and the new member?

• 1] 2 years
• 2] 4 years
• 3] 8 years
• 4] 15 years
##### Solution
2
Discuss

19 people went to a hotel for combine dinner party 13 of them spent Rs. 79 each on their dinner and rest spent 4 more than the average expenditure of all the 19. What was the total money spent by them.

• 1] 1628.4
• 2] 1534
• 3] 1492
• 4] 1496
• 5] None of these
##### Solution
3
Discuss

The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero ?

• 1]

0

• 2]

-1

• 3]

1

• 4]

None Of These

##### Solution
4
Discuss

The average age of three boys is 15 years. If their ages are in ratio 3 : 5 : 7, the age of the youngest boy is

• 1] 21 years
• 2] 18 years
• 3] 15 years
• 4] 9 years
• 5] 12 years
##### Solution
5
Discuss

A student finds the average of 10, 2 digits numbers. If the digits of one of the numbers interchanged, the average increases by 3.6. The difference between the digits of the 2 digits number is :

• 1] 4
• 2] 3
• 3] 2
• 4] 5
##### Solution
6
Discuss

If the mean of a,b,c is M and ab+bc+ca=0, then the mean of a2,b2,c2 is:

• 1]

M2

• 2]

3M2

• 3]

6M2

• 4]

9M2

##### Solution
7
Discuss

The reduction in the speed of an engine is directly proportional to the square of the number of bogies attached to it. The speed of the train is 100 km/hr when there are 4 bogies and 55 kmph when there are 5 bogies. What is the maximum number of bogies that can be attached to the train so that it can move?

• 1]

4

• 2]

5

• 3]

6

• 4]

7

##### Solution
8
Discuss

A cricketer scored some runs in his 21st innings, as a result, his average runs increased by 3. If the present average run is 40, how many runs he scored in the final innings?

• 1] 103
• 2] 100
• 3] 85
• 4] 82
##### Solution
9
Discuss

A man travels equal distances of his journey at 40, 30 and 15 km/h. respectively. Find his average speed for whole journey.

• 1] 24
• 2] 25
• 3] 27
• 4] 28
##### Solution
10
Discuss

Average of a, b, and c is 11; average of c, d and e is 17; average of e and f is 22 and average of e and c is 17. Find out the average of a, b, c, d, e and f.

• 1]

$$15\frac{2}{3}$$

• 2]

$$18\frac{1}{2}$$

• 3]

$$16\frac{1}{2}$$

• 4]

None of these

# Quiz