What number should be subtracted from each of the numbers 23,30,57 and 78 so that the remainders are in proportion

 A garden is 90 m long and 75 m broad. A path 5 m wide is to be built outside around it. Find the area of the path :

 A and B together can do a piece of work in 12 days and A alone can complete the work in 18 days. How long will B alone take to complete the job?

 Manu’s age is 6 times Binu’s age. 15 years hence Manu will be 3 times as old as Binu. Find Binu’s age :

If 4 taps can fill a tank in 10 hours. Then how many hours can 6 taps fill the same tank

In how many years will a sum of money triple itself, the rate of interest being 10%