9. A tank is 20m in length, 15m in breadth and 4m
in depth. Find the cost of cementing its floor and
the four walls at the rate of 50 per square metre.
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9. A tank is 20m in length, 15m in breadth and 4m
in depth. Find the cost of cementing its floor and
the four walls at the rate of 50 per square metre.
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Answer:
cost of cementing = ₹29,000
Step-by-step explanation:
here, TSA of cuboidal tank except top lead = 2(LB + BH + HL) - LB
= 2(20 × 15 + 15 × 4 + 4 × 20) - 20 × 15
= 2(300 + 60 + 80) - 300
= 2(440) - 300
= 880 - 300
= 580 m²
now, cost of cementing = rate of cementing × TSA of cuboidal tank except top lead
= ₹50/m² × 580m²
= ₹29,000
∴ cost of cementing = ₹29,000.
hope it will help you.
length= 20m
breagth=15m
depth(height)=4m
since, Volume of tank = lbh
=20x15x4
=1400m^2
hence, the cost of floor walls=1400x50
=70000 rs