Question

Correct the following equations by interchanging two signs :
$16-21÷7\times 6+3=31$

• A. $-$ and $\times$
• B. $+$ and $\times$
• C. $÷$ and $+$
• D. $÷$ and $\times$

Answer 1

The correct option is B $+$ and $\times$

If we'll interchange the signs $-$ and $\times$, the result will be

$16\times 21÷7-6+3=16\times 3-3=45$

Interchanging $+$ and $\times$, we get

$16-21÷7+6\times 3=16-3+18=31$

Interchanging $÷$ and $+$, we get

$16-21+7\times 6÷3=16-21+14=9$

Interchanging $÷$ and $\times$, we get

$16-21\times 7÷6+3=-11÷2$

Thus, interchanging $+$ and $\times$ gives us the required answer.

Hence B is the correct option.