Mr Tan pays $1 155 for a large box of pens for the school bookshop. Each pen costs $7. He then re-packs all the pens into small packets of 8 to sell to students. How many complete packets of 8 pens can Mr Tan make?
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Worked Solution
Step 1: Find the total number of pens.
$1 155 ÷ $7 = 165 pens
(Check: 7 × 165 = 7 × 160 + 7 × 5 = 1 120 + 35 = 1 155 ✓)
Step 2: Pack pens into packets of 8.
165 ÷ 8 = 20 remainder 5
(Check: 8 × 20 = 160; 160 + 5 = 165 ✓)
Step 3: Only complete packets count.
Leftover pens = 5 (do not form a full packet)
Answer: Mr Tan can make 20 complete packets.
Correct answer: 20
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