Discussion
If P denotes ÷; Q denotes ×, R denotes + and S denotes -, then what is the value of 18 Q 12 P 4 R 5 S 6 ?
Answer: A
Correct answer: 53
Substituting gives \[ 18 \times 12 \div 4 + 5 - 6. \] The multiplication and division are taken first, left to right: \( 18\times12 = 216 \), \( 216\div4 = 54 \). Then \( 54 + 5 - 6 = 53 \).
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