A contractor agreeing to finish a work in 150 days employed 75 men, each working for 8 h daily. After 90 days only 2/7 of the work was completed. How many more men would be put on now, each working 10 h daily so as to finish the work in the stipulated time?

6085 − 4017 + 1496 − 1124 = ?

A horse worth Rs. 9000 is sold by A to B at a loss of 10%. B sells the horse back to A at 10% gain. The result is

40 ÷ 0.80 ÷ 0.25 = ?

The banks of a river are parallel. A swimmer starts from a point on one of the banks and swims in a straight line inclined to the bank at 45° and reaches the opposite bank which is 20 m from the starting point. The breadth of the river is

45% of √225 + 21 = ?

The prices of sugar increase by 32%. A family reduces its consumption so that the expenditure on sugar is up only by 10%. If the total consumption of sugar before the price-rise was 10 kg per month, then the consumption of sugar per month at present, in kg, is

If the diameter of a cylinder is 20 cm and its height is 20 cm, then the surface area (in cm²) is

The ratio between the ages of A and B at present is 2 : 3. Five years hence the ratio of their ages will be 3 : 4. What is the present age of A in years?