Question

Answer the 6th question

Answer 1

Let B's present age be 'x' years.
Then A's present age = (x+25) years.
In 15 years,
(x+25)+15= 2(x+15)
x+40=2x+30 => 40-30=2x-x
10=x. therefore present age of B is 10 years and present age of A is 10+25= 35 years.

Answer 2

Let's take the age of B as $x$

So, the age of A will be $x$ + 25

After 15 years, their ages will be

A = $x$ + 25 + 15 (because 15 yrs have passed)
= $x$ + 40

B = $x$ + 15

$x$ + 40 = 2($x$ + 15)
$x$ + 40 = 2$x$ + 15

Now, transposition will take place.

2$x$ - $x$ = 40 - 30

Answer is 10 = $x$

The age of B is 10 yrs currently.
The age of A is 10 + 25 = 35 yrs.