Find the simple interest on a principal of Rs.1250 at the rate of 5% for a time of 219 days.

Speed of boat in upstream is 11km/hr and downstream is 23 km/hr find the speed of boat in still water?

Average of 11 number is 30. If the average of first 10 numbers is 22, then find the 11th number?

Population of a city is 7000. In next year the population is increased by 8%, then find the new population?

The ratio of coins of 50 paisa, 25 paisa, and 10 paisa is 4:3:2. Find the total amount if the number of coins is 90.

A number is divided into 3 parts A, B and C in the ratio of 3:2:1. If half of the number is 54, then find the square of the smallest number?

Average of 21 number is 36. If the average of first 12 numbers is 15, then find the average of remaining 9 number?

In a circle, difference between the circumference and radius is 37 cm. Find the area (in cm²) of the circle?