Piyush formed a larger cube from the material obtained by melting three smaller cubes of 3, 4 and 5 cm side. What is the ratio of the total surface areas of the smaller cubes and the large cube?

If the length of a rectangle is increased by 20% and its breadth is decreased by 20%, its area:

The ratio of investment by A to that by B in a business is 14 : 15 and the ratio of their respective profit at the end of a year is 2 : 5. If A invested the money for 3 months, then for how much time ( in months) B invested his money?

PAB and PCD are two secants to a circle . If PA 10 cm , AB = 12 cm and PC = 11 cm , then what is the value ( in cm ) of PD ?

In a class, there are ' z ' students. Out of them ‘x’ are boys. What part of the class is composed of girls? 

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

Total weekly emoluments of the workers of a factory is 1534. Average weekly emolument of a worker is 118. The number of workers in the factory is:

The greatest four digit number which is exactly divisible by each one of the numbers 12, 18, 21 and 28.