Tannu invests an amount of Rs 9535 at the rate of 4% p.a. to obtain a total amount of Rs 11442 on simple interest after a certain period. For how many years did she invest the amount to obtain the total sum ?

A sum of money is to be divided amongst X, Y and Z in the ratio 4 : 6 : 5 and another sum of money is to be divided between P and Q equally. If P got Rs 1225 less then X, how much amount did Y receive ?

The total number of boys in a school is 25% more than the total number of girls. What is the ratio of the total number of boys to the total number of girls ?

Out of the three given numbers, the first number is twice the second and thrice the third number. If the average of the three numbers is 121, what is the difference between the first and third number ?

A car travels a distance of 60 km at the speed of 20 kmph. If covers the next 80 km of its journey at the speed of 40 kmph and last 20 km of its journey at the speed of 5 kmph. What is average speed of the car.