The tens digit of a two digit number is less by 3 than the unit digit. If the product of the two digits is subtracted from the number, the result is 15. Let us write the unit digit of the number by calculation.

The distance between two places is 200 km.; the time taken by motor car from one place to another is less by 2 hrs than the time taken by a zeep car. If the speed of the motor car is 5 km/hr. more than the speed of the zeep car, then by calculating let us write the speed of the motor car.

The area of the Amita’s rectangular land is 2000 sq.m. and perimeter of it is 180 m. By calculating, let us write the length and breadth of the Amita’s land.

There are two pipes in a water reservoir of our school. Two pipes together take minutes to fill the reservoir. If the two pipes are opened separately, then one pipe would take 5 minutes more time than the other pipe. Let us write by calculating the time taken to fill the reservoir separately by each of the pipes.

Porna and Pijush together complete a work in 4 days. If they work separately, then the time taken by Porna would be 6 days more than the time taken by Pijaush. Let us write, by calculating, the time taken by Porna alone to complete the work.