Out of three numbers, the first is twice the second and half of the third. If the average of the three numbers is 56, then the difference of the first and the third number is

A wire when bent in the form of a square encloses an area of 484 sq cm. What will be the enclosed area when the same wire is bent in the form of a circle?

A boy on being asked what $6\over 7$ of a certain fraction was, made the mistake of dividing the fraction by $6\over 7$ and so got an answer which exceeded the correctanswer by $13 \over 70$ . Find the fraction

A, B and C enter into a partnership with a total capital of Rs. 8200. A's capital is Rs. 1000 more than B's and Rs. 2000 less than C's. At the end of the year what is B's share in the profit of Rs. 2460?

A hall, whose length is 16 metres and breadth twice its height, takes 168 metres of paper, which is 2 metres wide, for its four walls. Find the area of the floor.

The ratio of monthly salaries of two persons, A and B is 8 : 7. If the salary of A is increased by 20% and that of B by 11%, the new ratio becomes 96 : 77. What is A's salary?

Simple interest on a certain sum at 7 p.c.p.a for 4 years is Rs 3584. What will be the compound interest on the same principal at 4 p.c.p.a. in two years ?