Question : If $\frac{1}{2} $ is added to a number and the sum is multiplied by 3, the result is 21. Then the number is:
Option 1: 6.5
Option 2: 5.5
Option 3: 4.5
Option 4: –6.5
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Correct Answer: 6.5
Solution :
Let the number be $x$.
According to the question,
$(x + \frac{1}{2})\times 3=21$
⇒ $(x + \frac{1}{2}) =\frac{21}{3}=7$
⇒ $x =7- \frac{1}{2}$
$\therefore x =6.5$
Hence, the correct answer is 6.5.
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