a) 81000 cu.cm
b) 81775 cu.cm
c) 82125 cu.cm
d) None of these
Answer: c
Explanation: The external measures of the box are (115 + 5) cm, (75 + 5) cm, and (35 + 5) cm i.e., 120 cm, 80 cm and 40 cm
Volume of the wood :
= External volume – Internal volume
= [(120 × 80 × 40) – (115 × 75 × 35)] cm3
= (384000 – 301875) cm3
= 82125 cm3
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