DELHI POLICE MATHS QUIZ

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Question 1:

The average of 30 numbers is 15 . The average of the first 18 numbers is 10 and that of the next 11 numbers is 20 . The last number is

Question 2:

If a car covers a certain distance in 1 hour 24 minutes by covering two-third of the distance at $52 \mathrm{~km} / \mathrm{h}$ and the rest at $65 \mathrm{~km} / \mathrm{h}$, then find the total distance.

Question 3:

$\mathrm{A}$ is twice as good a laborer than $\mathrm{B}$. Together they can finish a work in 14 days. In how many days will $B$ alone complete the work?

Question 4:

The radius of a solid perpendicular cylinder is $21 \mathrm{~cm}$ and height is $16 \mathrm{~cm}$. Find its curved surface area.

Question 5:

The amount obtained by investing a certain sum at r% p.a. for 3 years at simple interest is equal to the simple interest on the same sum at the same rate for 13 years. The value of r is:

Question 6:

A shopkeeper marks an article 24% above its cost price and allows a 15% discount on the marked price. If he earns a profit of Rs. 27 by selling the article, then the selling price of the article is:

Question 7:

In a class, if $40 \%$ of the students are boys and the number of girls is 36 , then the number of boys is:-

Question 8:

If $(2000)^{10}=1.024 \times 10^{k}$ then the value of $k$ is

Question 9:

When x is added to each of 7, 13, 19 and 29, the numbers so obtained in this order are in proportion. What is the mean proportional between (3x – 8) and (x + 5)?

Question 10:

The sum of the age of a father and his son is 100 years now 5 years ago there age were in ratio of $2: 1$. The ratio of the age of father and son after 10 years will be: