Question

If Jane will be 18 years old in ten years, calculate her age.

• A. 6
• B. 7
• C. 8
• D. 9

Answer 1

The correct option is C 8

Let the present age of Jane is $x$ years.
Jane's age will be 18 in 10 years $=x+10$

Given: $x+10=18$

Put each option in the equation $x+10=18$ , which ever satisfy the equation will be the value of x.

Option (a) : put $x=6$
$\Rightarrow 6+10=16\ne 18$
Hence, the value of x does not satisfy the equation.

Option (b) : put $x=7$
$\Rightarrow 7+10=17\ne 18$
Hence, the value of x does not satisfy the equation.

Option (c) : put $x=8$
$\Rightarrow 8+10=18$
Hence, the value of x satisfies the equation.

Option (d) : put $x=9$
$\Rightarrow 9+10=19\ne 18$
Hence, the value of x does not satisfy the equation.

$\therefore x=7$ satisfies the given algebraic equation