Six years ago, the ratio of ages of A to B was 7 : 5. After 4 years from now, the ratio of their ages will be 11 : 9. What is A’s age at present?

From the top of an upright pole $$24\sqrt { 3} $$ feet high, the angle of elevation of the top of an upright tower was 60⁰. If the foot of the pole was 60 feet away from the foot of the tower, what tall (in feet) was the tower?

Successive discounts of 10% and 10% are equivalent to a single discount of:

For what value of m will the system of equations 18x-72y+13=0 and 7x-my-17=0 have no solution?

A and B can complete a work together in 48 days. A is 4 times as work efficient as B. In how many days can B alone complete the work?

The average marks obtained by Saloni in four papers is 51, and in the fifth paper she gets 56 marks. Find her new average in all five papers.

The ratio of the number of coins of 25 paise, 50 paise, Rs.2 and Rs.5 is 5 ∶ 4 ∶ 3 ∶ 1, respectively. If the total amount of the coins is Rs.285, then the difference between the number of 25 paise and Rs.5 coins is:

If 4x² + y² = 40 and xy = 6, then find the value of 2x + y.