Discussion
If ‘+’ stands for ‘×’, ‘-‘ for ‘÷’, ‘×’ for ‘-‘ and ‘÷’ for ‘+’, find the value of 12 + 90 - 5 × 9 ÷ 3.
Answer: C
Correct answer: 210
Substituting gives \[ 12 \times 90 \div 5 - 9 + 3. \] Multiplication and division first, left to right: \( 12\times90 = 1080 \), \( 1080\div5 = 216 \). Then \( 216 - 9 + 3 = 210 \). Stopping at 216, before the last two terms are applied, gives the second option offered.
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