alleryTwo biscuit boxes each hold 480 cm3: one is 3 × 8 × 20 cm and the other 4 × 12 × 10 cm. Which needs less material?
A3 × 8 × 20 box
B4 × 12 × 10 box
CBoth the same
DCannot be compared
Answer & Solution
Correct answer: B. 4 × 12 × 10 box
1. First box TSA = 2(24 + 60 + 160) = 488 cm2.
2. Second box TSA = 2(48 + 40 + 120) = 416 cm2.
3. The 4 × 12 × 10 box uses less material.
_Source: NCERT Class 8 Mathematics, Chapter 9 Mensuration, 9.5.2 Cube_
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