The simple interest at the rate of 6% per annum received on a principal of Rs. x was Rs. 482.40 when invested for 3 years in scheme A. If scheme B offered compound interest (compounded annually) at 10% per annum what was the interest received by investing Rs. (x-680) for 2 years in scheme B?

Mary paid 15% of her monthly salary towards an EMI. From the remaining salary, she paid 10% as internet bill and 20% as rent. If after the mentioned expenses she was left with Rs. 24,990, what was Mary's monthly salary?

The sum of 4 consecutive even numbers is 107 more than the sum of three consecutive odd numbers. If the sum of smallest odd number and the smallest even number is 55, what is the smallest even number?

A, B and C, each working alone, can finish a piece of work in 27, 33 and 45 days respectively. A starts by working alone for 12 days, then B takes over from A and works for 11 days. At this stage C takes over from B and completes the remaining work. In how many days the whole work was completed?

A rectangular garden of length 12m is surrounded by a 2m wide path. If the area of the garden is 84 m2 and the cost of gravelling is Rs. 8 per m2, what is the total cost of gravelling the path? ( in Rs.)

Train A, travelling at 's' m/sec, can cross a platform double its length in 21 seconds. The same train, travelling at (s + 5) m/ sec. can cross the same platform in18 seconds. What is the value of 's'?

The present age of Charu is 2.5 times the present age of Harsh. Had Harsh been two years younger and Charu been 13 years older, Charu's age would have been 3.5 times Harsh's age. What is Harsh's present age?