What should come in place of the question mark (?) in the following equation? $\sqrt{484} \times \sqrt{169} = ? + 50\%$ of 312

Correct answer: 160

Solution

$\sqrt{484}=22$ and $\sqrt{169}=13$, so the left side is $22\times 13=286$. Also, 50% of 312 is 156. Therefore, $?=286-156=130$. The provided answer key says 160, but the correct value from the given equation is 130.

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