DELHI POLICE QUANT (AVERAGE) QUIZ

Question 1:

The average age of four brother is 10 years. If the age of their mother is also included the average is increased by 5 years. The age of mother is:

35 years

30 years

40 years

None of these

Question 2:

In a family, the average age of father and a mother is 38 years. The average age of father mother and their son is 29 years. What is the age of the son?

10 years

$10.5$ years

12 years

11 years

Question 3:

The average of 3 consecutive integers starting with ' $a$ ' is ' $b$ '. what is the average of 5 consecutive integers starting with $(a+5)$ ?

$\frac{b+6}{2}$

$(b+3)$

$(\mathrm{b}+5)$

$(b+6)$

Question 4:

If the average of $a$ and $\frac{1}{a}(a \neq 0)$ is $x$, then the average of $a^{3}$ and $\frac{1}{a^{3}}$ is:

$2 x^{3}-\frac{3 x}{2}$

$4 x^{3}-\frac{3 x}{2}$

$4 x^{3}-3x$

$4 x^{3}-\frac{x}{2}$

Question 5:

The average of square of natural numbers from 1 to 92 is?

2116

2209

2859.5

2867.5

Question 6:

The average of odd numbers up to 220 is:

110

109

111

119.5

Question 7:

The average of 37 consecutive numbers is 26. The largest of these numbers is:

43

44

45

41

Question 8:

The average of 14 numbers is 22. if the average of the first 5 numbers is 18 and that of the last 6 numbers is 25. Then find the average of the remaining numbers.

22.33

22.67

14.33

14.67

Question 9:

The average weight of P and his three friends is 55 kg. If P is 4 kg more than the average weight of his three friends, what is P's weight (in kg)?

54

58

62

60

Question 10:

If $A$ is $\frac{1}{6}$ th of $C$, and $B$ is twice of $A$, and the average of $A, B$ and $C$ is 30 , then the difference between $A$ and $C$ is:

40

60

50

80