Question

Joshita is 5 times as old as her brother and also 20 years older than her brother. How old is her brother?

• A. $6years$
• B. $3years$
• C. $5years$
• D. $4years$

Answer 1

Answer: (C)

$5years$

Joshita's current age be x
and her brother current age be y
$\therefore$ First equation written as
$x=5y$ ----- (1)
second equation written as
$x=y+20$ ----- (2)
Substitute the value of x in equation (2)
$5y=y+20$
$5y-y=20$
$4y=20$
$y=5$
Put the value of y in equation (1)
$x=5\times 5$
$x=25$
Therefore age of Joshita's brother is 5 years