Discussion
If ‘-‘ stands for ‘÷’, ‘+’ stands for ‘×’, ‘÷’ stand for ‘-‘ and ‘×’ stands for ‘+’, which one of the following question is correct?
Answer: A
Correct answer: 30 – 6 + 5 × 4 ÷ 2 = 27.
Substituting in this option gives \[ 30 \div 6 \times 5 + 4 - 2. \] Taking the divide and multiply first: \( 30\div6 = 5 \), \( 5\times5 = 25 \). Then \( 25 + 4 - 2 = 27 \), which matches the stated value. The other three fail once their symbols are replaced.
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