quantitave aptitude

A can lay railway track between two given stations in 16 days and B can do the same job in 12 days. With help of C, they did the job in 4 days only. Then, C alone can do the job in:

A alone can do a piece of work in 6 days and B alone in 8 days. A and B undertook to do it for Rs. 3200. With the help of C, they completed the work in 3 days. How much is to be paid to C?

• 375

• 400

• 600

• 800

A sum of money at simple interest amounts to Rs. 815 in 3 years and to Rs. 854 in 4 years. The sum is:

• 650

• 690

• 698

• 700

The length of the bridge, which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds, is

• 200

• 225

• 245

• 250

Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is:

• 1:3

• 3:2

• 3:4

• 2:3

What least number must be added to 1056, so that the sum is completely divisible by 23 ?

• 2

• 3

• 18

• 21

What is the difference between the compound interests on Rs. 5000 for 1 years at 4% per annum compounded yearly and half-yearly?

• Rs. 2.04

• Rs. 3.06

• Rs. 4.80

• Rs. 8.30

The compound interest on Rs. 30,000 at 7% per annum is Rs. 4347. The period (in years) is:

• 2

• 2.5

• 3

• 4

A family consists of two grandparents, two parents and three grandchildren. The average age of the grandparents is 67 years, that of the parents is 35 years and that of the grandchildren is 6 years. What is the average age of the family?

• 28 4/7years

• 31 5/7years

• 32 1/7 years

• 30 5/7years

In a mixture 60 litres, the ratio of milk and water 2 : 1. If this ratio is to be 1 : 2, then the quantity of water to be further added is:

• 20L

• 30L

• 40L

• 60L