A and B start a common business by placing their capital in the ratio of 5: 6. After 8 months A withdraws his capital. They received dividends in the ratio of 5: 9. For how long did B invest his capital?

Four coins whose diameter is 12.6 cm are placed in such a way that one coin touches the other coin, find the area between them.

The ratio of the areas of two circles is 16: 25. What will be the ratio of their circumferences?

The perimeter of a circle is equal to the square perimeter. What will be the ratio of their areas?

42 cm a circular wire of diameter is folded into a rectangle whose sides are in the ratio 6: 5. What will be the area of the rectangle?

What will be the change in the volume of a rectangular solid by increasing its length by 10 percent and decreasing its width by 10 percent?

Each side of an equilateral triangle is 4 cm. What will be its area?

What will be the difference between the compound interest and simple interest of 2 years at the rate of 5 percent annual interest at Rs. 4,000?