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01 Jul 2015, 03:04
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D
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A rectangular tank needs to be coated with insulation. The tank has dimensions of 4 feet, 5 feet, and 2.5 feet. Each square foot of insulation costs $20. How much will it cost to cover the surface of the tank with insulation?
A. $1000
B. $1300
C. $1500
D. $1700
E. $1900
Kudos for a correct solution.
A. $1000
B. $1300
C. $1500
D. $1700
E. $1900
Kudos for a correct solution.
01 Jul 2015, 03:58
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Bunuel
A rectangular tank needs to be coated with insulation. The tank has dimensions of 4 feet, 5 feet, and 2.5 feet. Each square foot of insulation costs $20. How much will it cost to cover the surface of the tank with insulation?
A. $1000
B. $1300
C. $1500
D. $1700
E. $1900
Kudos for a correct solution.
A. $1000
B. $1300
C. $1500
D. $1700
E. $1900
Kudos for a correct solution.
Let, Length (L) = 4 feet
Width (B) = 5 feet
Height (H) = 2.5 feet
Total Surface Area of Rectangular Solid = 2(LB + BH + LH)
i.e. Total Surface Area of the tank to be painted = 2*(4*5 + 5*2.5 + 4* 2.5) = 2*(20+12.5+10) = 85 square feet
Cost of Painting 85 square feet @$20 per square feet = 85*20 = $1700
Answer: option D
01 Jul 2015, 05:29
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Dimensions of the tank = 4X5X2.5
Total Surface Area of Cuboid = 2(lb + bh + lh) = 2(20 + 12.5 + 10) = 85 sq.ft.
Cost of insulating 1 sq.ft = $20, so total cost = 85*20 = $1700. Ans D.
Total Surface Area of Cuboid = 2(lb + bh + lh) = 2(20 + 12.5 + 10) = 85 sq.ft.
Cost of insulating 1 sq.ft = $20, so total cost = 85*20 = $1700. Ans D.
