Question

10 years from now Mark’s age will be 2 times his present age. What is Mark’s present age?​

Answer 1

I think it’s 20 years

Answer 2

Answer:

Let Mark’s present age be x years.

After ten years, Mark’s age = 10x years.

Ten years from now, Marks’s age = (x+10) years.

According to question, 4x = x + 10

\Rightarrow\ 4x-x=10⇒ 4x−x=10

[Transposing x to L.H.S]

3x = 10

\Rightarrow\ \frac{3x}{3}=\frac{15}{3}⇒

3

3x

=

3

10

[Dividing both sides by 3]

x = 10 years.

Hence, Mark’s present age be 5 years.