Question

In the algebraic expression, $x+99=100$, the value of unknown is

• A. 0
• B. 1
• C. 2
• D. 3

Answer 1

The correct option is B 1

The unknown is $x$
We need to solve $x$ by isolating it to one side of the equation

$x+99=100$

Subtract both sides of the equation with 99 to eliminate the constant on the left side of the equation.
$\Rightarrow x+99-99=100-99\Rightarrow x=1$