✅ (c) 450:
· Convert box dimensions to cm: 1.5 m = 150 cm, 0.75 m = 75 cm, 0.60 m = 60 cm
· Volume of box = 150 × 75 × 60 = 675000 cm³
· Volume of one book = 20 × 10 × 7.5 = 1500 cm³
· Number of books = 675000 ÷ 1500 = 450 books
❌ (a) 350: Incorrect calculation of volume or arrangement. ❌ (b) 400: Incorrect volume division. ❌ (d) 500: Overestimation beyond box capacity.
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