Two students appeared at an examination. One of them secured 9 marks more than the other and his marks were 56 % of the sum of their marks. The marks obtained by them are: 

Which of the following is a perfect square as well as a cube ? 

(5.5)³-(4.5)³ is equal to : 

$$3\sqrt{ {72.9\over0.4096}}$$ is equal to : 

1008 divided by which single-digit number gives a perfect square?

The total surface area of a cube is 864 square cm. What is his volume?

The volume of a sphere and an elliptical cylinder are the same. The radius of the sphere and cylinder are 21 cm and 14 cm respectively. What is the height of the cylinder?

The price of 6 pencils is Rs. 30 and that of 12 pens is Rs. 120. What is the average price of 50 pencils and 50 pens?