44
Q:

# The sum of the ages of 5 children born at the intervals of 3 years each is 50 years. what is the age of the youngest child ?

 A) 4 B) 8 C) 10 D) None

Explanation:

Let x = the youngest child. Each of the other four children will then be x+3, x+6, x+9, x+12.

We know that the sum of their ages is 50 .

so, x+(x+3)+(x+6)+(x+9)+(x+12) = 50

=>  x= 4

The youngest child is 4 years old.

Q:

The average age of the number of persons in a group was calculated as 35 years, which was 2.5 years more than the correct average as there was an error in recording the age of two persons as 38.5 years and 40 years instead of 29 years and 22 years respectively. The number of persons in the group was:

 A) 11 B) 12 C) 15 D) 13

Explanation:

1 212
Q:

The sum of the present ages of two persons is seven times that of the difference between their ages. After 5 years, the sum of their ages will become nine times that of the difference. What is the present age of the elder person?

 A) 24 years B) 28 years C) 14 years D) 20 years

Explanation:

1 201
Q:

The ratio of the ages of A and B, 8 years ago, was 2 : 3. Four years ago, the ratio of their ages was 5 : 7. What will be the ratio of their ages 8 years from now?

 A) 4 : 5 B) 5 : 6 C) 7 : 8 D) 3 : 4

Explanation:

1 372
Q:

A group of three friends, K, L and M, are sitting in a cafe. Their average age is 24 years. Another friend ‘N’ joins the group and the new average age of the group becomes 23 years. If another friend ‘R’, whose age is 2 years more than that of ‘N’, replaces ‘K’, then the average age of L. M, N and R becomes 22.5 years. What is the age of K?

 A) 15 years B) 10 years C) 12 years D) 14 years

Explanation:

0 303
Q:

The average age of A and B is 20 years. and that of B and C is 25 years. What is the age of A?

 A) 25 years B) 10 years C) 15 years D) 20 years

Explanation:

6 1212
Q:

The sum of the current ages of A and B is 77 years. Seven years ago A was 2.5 times as old as B. What is A's present 4 age?

 A) 50 years B) 54 years C) 48 years D) 52 years

Explanation:

1 555
Q:

Sourish is now 25 years old while his cousin is 7 years. After how many years will Sourish's age be 2.5 times that of his cousin?

 A) Emperor Humayun B) Emperor Babur C) Emperor Akbar D) Emperor Jahans

Explanation:

1 302
Q:

Mohan's mother was four times as old as Mohan ten years ago. After 10 years, she will be twice as old as Mohan. How old is Mohan today?

 A) 20 years B) 15 years C) 22 years D) 32 years