The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?

A fruit seller had some apples. He sells 40% apples and still has 420 apples. Originally, he had

A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the train is 54 km/hr, what is the length of the platform?

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:

In how many ways can the letters of the word ‘LEADER’ be arranged?

Square root of 1.5625 = ?

In what ratio must a grocer mix two varieties of pulses costing Rs. 15 and Rs. 20 per kg respectively so as to get a mixture worth Rs. 16.50 kg?

A father said to his son, “I was as old as you are at the present at the time of your birth”. If the father’s age is 38 years now, the son’s age five years back was:

A clock is started at noon. By 10 minutes past 5, the hour hand has turned through:

How much time will it take for an amount of Rs. 450 to yield Rs. 81 as interest at 4.5% per annum of simple interest?