Question

find the cost of painting a tank of degeneration 3 m × 2 m × 1.5 m at rupees 20 per square metre.
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Answer 1

here is your answers
volume of cuboid
$l \times b \times h$
$= 3 \times 1.5 \times 2 = 9m \: cube$
cost of painting a tank
$9 \times 20 = 180rupees$
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