Question

One third of any number is equal to 21. Then the number will be:

• A. 21
• B. 42
• C. 63
• D. 84

Hint:

To find a number when a fraction of it is known, multiply both sides of the equation by the reciprocal of the fraction.

Answer 1

The Correct Option is C

Step 1: Understanding the problem.
We are given that one third of some number is equal to 21. Let the unknown number be \( x \). \[ \frac{1}{3} \times x = 21 \]
Step 2: Solving for the number.
To find \( x \), we multiply both sides of the equation by 3: \[ x = 21 \times 3 = 63 \]
Step 3: Conclusion.
The number is 63.