Question

\[\begin{array}{|c|c|c|} \hline 15 & 225 & 30 \\ \hline 7 & 70 & 20 \\ \hline 3 & ? & 8 \\ \hline \end{array} \]

• A. 70
• B. 12
• C. 16
• D. 24

Hint:

When a center number seems tied to the two ends, try operations like product and then divide by a constant—verify across rows before applying to the missing entry.

Answer 1

The Correct Option is B

Row-wise rule: The middle entry of each row equals \(\dfrac{\text{left} \times \text{right}}{2}\). \[ \begin{aligned} &\text{Row 1: } \frac{15 \times 30}{2} = 225 \quad \checkmark &\text{Row 2: } \frac{7 \times 20}{2} = 70 \quad \checkmark &\text{Row 3: } \frac{3 \times 8}{2} = 12. \end{aligned} \] \[ \boxed{12} \]