For a kopitiam bill calculation, Cikgu Aisha writes the following expression on the board: 8 × (15 − 9) ÷ 4 + 7. What is the correct value of this expression?
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Worked Solution
Step 1: Apply the order of operations (BODMAS): Brackets, then × and ÷ left to right, then + and − last.
Step 2: Brackets first: (15 − 9) = 6. Expression becomes 8 × 6 ÷ 4 + 7.
Step 3: × and ÷ from left to right: 8 × 6 = 48, then 48 ÷ 4 = 12. Expression becomes 12 + 7.
Step 4: Addition: 12 + 7 = 19.
Check (reverse): 19 − 7 = 12; 12 × 4 = 48; 48 ÷ 8 = 6; 15 − 6 = 9 ✓.
Final answer: 19.
Answer: 19
Correct answer: 19
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