A sum of money at double the rate of simple interest doubles itself in 10 years. In how much time will that amount be triple of itself?

If the difference between 2 years compound interest and simple interest at the rate of 5 percent of an amount is Rs. 25, then that amount will be?

The following table shows the number of units of product produced and sold by a company over the course of six years.

Find the ratio between the total number of units sold in 2013 and 2015 and the number of units produced in 2015 and 2016?

What is the value of ?

If the ratio of the areas of two similar triangle ABC and DEF is 36:81 and EF = 6.9 cm., then BC is equal to –

Directions: The line graph shows the number of work visas issued by a country in each year from 2011 to 2016. Study the diagram and answer the following questions . 

What is the total number of visas issued from 2012 to 2015 ? 

Aman and Ajay can build a wall in 9 days and 12 days respectively. In how many days can they finish the work if they work together?

A circle and a rectangle have the same perimeter. The sides of the rectangle are 18 cm and 26 cm. The area of the circle is: