Question

A number consists of 20 plus 20% of its value. The number is

• A. 20
• B. 22
• C. 25
• D. 30

Answer 1

Answer:

C. 25

The number is 25.

How to solve it:

1. Let the unknown number be $x$.

2. Write the equation based on the statement:
   $x = 20 + 20\% \text{ of } x$

3. Convert the percentage to a decimal ($20\% = 0.20$):
   $x = 20 + 0.2x$

4. Move all $x$ terms to one side:
   $x - 0.2x = 20$
   $0.8x = 20$

5. Solve for $x$:
   $x = \frac{20}{0.8} = 25$