Father is 5 years older than mother and mother’s age is now thrice the daughter’s age. If daughter is 10 years old now, what was father’s age when daughter was born?
The greatest value of sin x. cos x is
The radius of a sphere is increased by 50%. The percentage increase in surface area is
The ratio between the ages of father and son is 5 : 2. If seven years ago the father was 43 years old, what is the present age of son?
How many of the numbers between 200 and 500 begin or end with 3 ?
One person sees his image in a mirror. If he walks backwards with a speed of 5 m./hour he sees his image moving with a speed of
