List of top Data Interpretation & Logical Reasoning (DILR) Questions on distance

If the average age of a group of 5 people is 30 years, and one person leaves the group, what is the new average age?

After five years, A's age will be 10.5 years less than 2.5 times of C's age. Three years ago, the ratio of age of A and C is 3: 1. If B is three times the age of C, then what is the present age of B?

Present age of P is 15 years, and he invested Rs.4500 at 20% annual Compound Interest while Q invested Rs.5824 at 25% annual Compound Interest. When they both turn 18 years, interest amount received by both of them is same, then how old are Q at present?