A school hall has 28 rows of chairs with 36 chairs in each row. After the National Day concert, 18 chairs are found to be broken and set aside. The remaining chairs are stacked into groups of 9 for storage. How many complete groups of 9 chairs can be made?
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Worked Solution
Step 1: Find the total number of chairs in the hall.
28 × 36 = 28 × 30 + 28 × 6
= 840 + 168
= 1 008 chairs
Step 2: Subtract the broken chairs.
1 008 − 18 = 990 working chairs
Step 3: Divide working chairs into groups of 9.
990 ÷ 9 = 110 complete groups
Verify: 9 × 110 = 990 ✓
Answer: 110 complete groups of 9 chairs can be made.
Correct answer: 110
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