Math MCQ Part-8

A is 3 times as fast as B and is, therefore, able to complete a work in 32 days lesser than B. A and B, working together, can complete the work in

The average age of 3 friends is 23 years. Even if the age of 4th friend is added, the average age remains the same. Then the age of the fourth friend is:

If the tax on a commodity is diminished by 20% and its con- sumption increases by 15%, the revenue decreases by:

A person deposited 500 for 4 years and 600 for 3 years at the same rate of simple interest in a bank. Altogether he received 190 as interest. The rate of simple interest per annum was

L.C.M of 2/3, 4/9 and 5/6

A tap can empty a tank in 30 minutes. A second tap can empty it in 45 minutes. If both the taps operate simultaneously, how much time is needed to empty the tank ?

A book is sold at three successive discounts of 20%, 20% and 10%. What is the net díscount (ín per cent) ?

The difference between mean proportion of 9 & 16 and 4 & 9 is :

In what ratio, sugar costíng 60 per kg be mixed with sugar costing 42 per kg such that by selling the mixture at 56 per kg there is a gain of 12% ?

Find the value of "k" such that the number k53206k is divisible by 6.