DELHI POLICE CONSTABLE QUANT QUIZ

Question 1:

Average of 'n' numbers is increased by $2.4$ when a two-digit number is considered in reverse order. If difference between digits of the number is $8 .$ Find value of 'n'?

30

31

24

20

Question 2:

Sum of two number is 80 and their product is 750 . What will be sum of their reciprocal?

$\frac{1}{40}$

$\frac{8}{75}$

$\frac{75}{8}$

$\frac{75}{4}$

Question 3:

What should come in place of question mark ‘?’ in the following series?

$51, 48, 55, 52, ?, 56$

58

59

60

57

Question 4:

If the sides of a triangle are in the ratio 3 : 4 : 5 and its area is 216 sq cm, then the perimeter of the triangle will be-

76 cm

84 cm

80 cm

72 cm

Question 5:

Pipe A and Pipe B can fill a tank in 4 and 16 hours respectively. In how many hours they together can fill the tank.

$\frac{4}{15}$ hours

$\frac{17}{3}$ hours

$\frac{16}{5}$ hours

$\frac{16}{7}$ hours

Question 6:

A boat goes at a speed of 10 km/h in still water. A man on that boat finds that it took him twice as long to come upstream from the boat as it does to go downstream. The speed of the stream (in km/h) is?

$4 \frac{1}{2}$

$3 \frac{1}{3}$

$4$

$5$

Question 7:

If the standard deviation of a distribution is 36, what is the value of the variance?

$6$

$4 \sqrt{6}$

$1296$

$1324$

Question 8:

Direction : What will come in place of question mark (?) in the following equation?

$34.2 \times 17.4 \times 1.5=2 \times ?$

$432.12$

$440.62$

$446.31$

$448.32$

Question 9:

Direction : Read carefully the following data carefully and answer the following Question.
Number of pen sold by four stores A, B, C and D the on 5 different days of the week from Monday to Friday is given in the table.

On Saturday the number of pen sold by store A was $\frac{5}{9}$ th of that sold on Friday by the same store. What was the number of pen sold by store A on Saturday?