If a-b=1 and a3-b3 = 61, then the value of ab will be

If p = 99, then the value of p(p2+3p+3) will be

If the simple interest on Rs. 1 for 1 month is 1 paisa, then the rate percent per annum will be

Speed of a boat along and against the current are 14 kms/hr and 8 kms/hr respectively. The speed of the current is

A's salary is 50% more than that of B. Then B's salary is less than that of A by

A dishonest dealer professes to sell his goods at cost price but uses a weight of 875 gms for the kilogram weight. His gain in percentage is

The average age of 36 students in a group is 14 years. When the teacher's age is included in it, the average increases by one. The teacher's age in years is

Sum of two numbers is thrice their difference. Their ratio is