Question

After 15 years, Monica will be
four times as old as she is now,
Determine her present age.​

Answer 1

let the present age of monica be x

after 15 years =x+ 15

she would be four times more = 4(x)

=x+15=4(x)

=x+15=4x

=15= 4x-x

15=3x

x=15/3

x=5

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check

5+ 15 = 20

20 is four times 5

so my answer is 100% correct

Answer 2

$\mathfrak{\large{\underline{\underline{Answer :-}}}}$

Monica is presently 5 years old.

$\mathfrak{\large{\underline{\underline{Explanation :-}}}}$

Given :

After 15 years - She will be

four times as old as she is now

To Find :

Her present age

Solution :

Consider her present age as x

Age after 15 years - (x + 15)

According to the Question -

She will be 4 times her age after 15 years

★ $\boxed{\sf{x+15=4x}}$

$\longrightarrow \: x + 15 = 4x$

$\longrightarrow \: 4x - x = 15$

$\longrightarrow \: 3x = 15$

$\longrightarrow \: x = \dfrac{15}{3}$

$\longrightarrow \: x = 5$

$\therefore$ Monica is presently 5 years old.

$\rule{300}{1.5}$

$\mathfrak{\large{\underline{\underline{Verification :-}}}}$

$\longrightarrow \: 5 + 15 = 4(5)$

$\longrightarrow \: 20= 20$

$\therefore$ Monica is presently 5 years old.