[39 years] In 10 years, A will be twice as old as B was 10 years ago. If A is now 9 years older than B, the pre

Easy Tutorial

For Competitive Exams

Aptitude

TNPSC G4

10th CBSE Maths

In 10 years, A will be twice as old as B was 10 years ago. If A is now 9 years older than B, the present age of B is:

19 years

29 years

39 years

49 years

Explanation:

Let the present ages of B and A be x years and (x+9) years respectively.
Then 10 years ago Bs age is (x - 10) and in the next 10 years As age is (x + 19)
Given that As age is twice of B
So (x + 19) = 2 x (x - 10) ⇒⇒ x + 19 = 2x - 20 ⇒⇒ x = 39

Additional Questions

The sum of the ages of a son and father is 56 years. After 4 years, the age of the father will be three times that of the son. Their ages respectively are:	Answer
Express a speed of 36 Kmph in meters per second?	Answer
The speed of a train is 90 Kmph. What is the distance covered by it in 10 minutes?	Answer
In what time will a railway train 60 m long moving at the rate of 36 Kmph pass a telegraph post on its way?	Answer
The sum of the interior angles of a polygon is twice the sum of its exterior angles. How many sides does the polygon have?	Answer
Two trains of equal length 120 metres move in the same direction. The faster train completely overtakes the slower one in 15 seconds. If the slower train were to move at half its speed, the over taking would take in 10 seconds. At what speeds are the 2 trains moving (faster and slower respectively in m/s)	Answer
If (a – b) is 9 more than (c + d) and (a + b) is 3 less than (c – d), then (a – c) is:	Answer
When simplified, the product (1 – 1/2) (1 – 1/3) (1 – 1/4)…… (1 – 1/n) gives:	Answer
If a * b = 2a – 3b + ab, then 5 * 7 + 7 * 5 is equal to:	Answer
If x = a/(a – 1) and 1/(a – 1), then:	Answer

Share with Friends