Mathematics

 A car washer can wash 8 cars in 18 minutes. At this rate how many cars can be wash, in three hours?

(a) 13

(b) 40

(c) 80

(d) 125

 If 12 years are added to 2/3 age of Rani, she will be three years older than today. What is Rani’s present age?

(a) 25

(b) 27

(c) 26

(d) 29

A’s mother is twice as old as A’s brother. A is 6 years younger than his brother but 4 years older than his sister. If A’s sister is 15 his mother’s age is:

(a) 40

(b) 45

(c) 42

(d) 50

10 men can complete a job in 14 days. How long will it take 4 men to finish the same job if they work at the same rate?

(a) 33 days

(b) 35 days

(c) 37 days

(d) 39 days

The speed of a car is 30km first hour and 32 km in the second hour. Its average speed is

arily comes:

(a) 30 km

(b) 31 km

(c) 32 km

(d) 33 km

The enrollment in a certain secondary school was 450 in 1979. By 1980 the enrollment had increased by 16%, what was the enrollment in 1980?

(a) Rs 512

(b) Rs.518

(c) Rs.522

(d) Rs 526