A person buys 25 pens worth 250, each of equal cost. He wants to keep 5 pens for himself and sell the remaining to recover his money. What should be the price of each pen?

A father’s age is four times that of his son. After 5 years, it will be three times that of his son. How many more years will take if father’s age is to be twice that of his son?

Find a number which when multiplied by 7 is as much above 132 as it was originally below it.

The sum of the digits of a two-digit number is 12. If the new number formed by reversing the digits is greater than the original number by 18, find the original number. Check your solution.

The distance between two stations is 340 Km. Two trains start simultaneously from these stations on parallel tracks and cross each other. The speed of one of the them is greater than that of the other by 5 Km/hr. If the distance between two trains after 2 hours of their start is 30 Km., find the speed of each train.