Find the cost of painting 12 oil containers from outside at rupees per square metre. The dimensions of each container being 60 cm by 40 cm by 56cm.
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Answer:
Total surface area of this cuboid
= 2(lb+bh+hl)
= 2(60×40 + 40×30 + 30×60)
= 2(2400+1200+1800)
= 2(5400)
= 10800cm²
so,
cost to paint 20 cm² = 50 p
cost to paint 1 cm² = 50/20 p
cost to paint 10800 cm² = 50×10800/20 = 27000 p = 270 rs.
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