A can do a piece of work in 9 days while B can do it in 12 days. A and B together can do the work in 

A retailer gets a discount of 40% on the marked price of an article. The retailer sells it at the printed price. His gain percent is

• 40%

• 55%

• 
• 

A mixture contains spirit and water in the ratio of 3 : 2. If it contains 3 litre more than water, the quantity of spirit in the mixture is

• 12 litre

• 10 litre

• 9 litre

• 9 litre

If the cost price of 25 pens is equal to the selling price of 20 pens, then the profit percent is:

• 20%

• 25%

• 15%

• 15%

55.

A number is decreased by 10% and the resulting number is again decreased by 20%. What is the final percentage of decrease?

• 25%

• 26%

• 27%

• 27%

The distance between two places A and B is 60 km. Two cars start at the same time from A and B, travelling at a speed of 35 km/hr and 25 km/hr respectively. If the cars run in the same direction, then they will meet after (in hours):

• 6.5

• 6.2

• 6

• 6

The sum of money that will yield ₹ 60/- as simple interest at 6% per annum in 5 years is

• ₹ 200/-

• ₹ 225/-

• ₹ 175/-

• ₹ 175/-

If x, y and z are real numbers such that (x - 3)² + (y - 4)² + (z - 5)² = 0, then (x + y + z) is equal to

• -12

• 0

• 8

• 8

If  then the value of  is

• 1/4

• 1/6

• 1/5

• 1/5

The orthocentre of a triangle is the point where

• the medians meet

• the altitudes meet

• the right bisectors of the sides of triangle meet

• the right bisectors of the sides of triangle meet