The school canteen uses the expression 3(2m + 5) − 4m to calculate the number of meal sets prepared each day, where m is the number of classes ordering that day. On a particular day, m = 9. How many meal sets are prepared?
Show Worked Solution
Worked Solution
Step 1: Substitute m = 9 into 3(2m + 5) − 4m.
3(2 × 9 + 5) − 4 × 9
Step 2: Work out the bracket.
2 × 9 = 18, then 18 + 5 = 23
Step 3: Multiply by 3.
3 × 23 = 69
Step 4: Subtract 4m.
4 × 9 = 36
Step 5: Final answer.
69 − 36 = 33
33 meal sets are prepared.
Correct answer: 33
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