11.A fathers is 7 years older than the mother and the mother's age now is 3 times the age of the daughter.The daughter is 10 years old now.What was the father's age when the daughter was born ?

12.40 men can finish a work in 15 days .If the work is to be completed 3 days earlier,how many more people should be employed ?

13.The value of 2x(2.11+2.23+2.16)is

14.The value of (3²-2²)²+(5²-4²)²+(6²-5²)² is

15.#Q The least number which is divisible by all the natural numbers upto and including 10 is #Q The least number which is divisible by all the natural numbers upto and including 10 is