Discussion
If × stands for ‘addition’, ÷ stands for ‘subtraction’, + stands for ‘multiplication’ and – stands for ‘division’, then 20 × 8 ÷ 8 – 4 + 2 = ?
Answer: C
Correct answer: 24
Substituting gives \[ 20 + 8 - 8 \div 4 \times 2. \] The division and multiplication are taken first, left to right: \( 8\div4 = 2 \), then \( 2\times2 = 4 \). What remains is \( 20 + 8 - 4 = 24 \). Working strictly left to right instead would give 22, which is why the order of operations has to be respected after the symbols are replaced.
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