Discussion
The following equation is incorrect. Which two signs should be interchanged to correct the equation? 15 x 12 + 40 ÷ 40 - 6 = 21
Answer: A
Correct answer: + and x
Exchanging + and × gives \( 15 + 12 \times 40 \div 40 - 6 \), which works out as \[ 15 + 12 - 6 = \mathbf{21} \]
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