Question

the sum of the ages of A and B is 39. In 15 years time the age of A will be twice the age of B.Find their present ages

Answer 1

Answer:

Let the present age of B be x years. ,

Then, the present age of A would be (x+9) years.

After 10 years, the age of A would be (x+9+10)=(x+19) years and before then years, the age of B was (x−10) years.

Now, from the information given in the question,

(x+19)=2(x−10)

or x+19=2x−20 or x=19+20=39 years

Therefore, the present age of B is 39 years.

Hence, the correct answer is (C).

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Answer 2

Answer:

: Option C

Explanation:

Let B's age = x years.

Then, As age = (x+ 9) years.

(x+9+10)=2(x—10)

hence x=39.

Present age of B = 39 years