Question

Sum of the ages of three friends is $x$, what is the sum of their ages after $3$ years?

• A. $x+3$
• B. $x+9$
• C. $x+6$
• D. $x$

Answer 1

The correct option is B $x+9$

Assumption:

Let the present ages of 3 friends be: $y,z,t$ years, respectively.
Sum of ages of 3 friends $=$$y+z+t=x$ ....Given

To find out: Sum of their ages after 3 years

Solution:

Ages of $3$ friends after $3$ years $=y+3$, $z+3$ and $t+3$.
$\therefore$ Sum of their ages, then
$=y+3+z+3+t+3$
$=y+z+t+9$
$=(x+9)$ years