Question

Ana is 24‐year old when her son is born. In how many years

will Ana be thrice as old as her son?

Answer 1

In 12 years.

Ana will be 36-year old.

$\frac{36}{3}=12$

or

$24 + x = x \times 3 \\ 24 = 3x-x \\ 24 = 2 x \\ x = \frac{24}{2} = 12$