plz answer question no. 13
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Given external dimensions of the wooden bookshelf are:
Height = 110 cm, depth = 25 cm and breadth = 85 cm
Total surface area (external) of the shelf = 2(lb + bh + hl) sq units
= 2[110(85) + 85(25) + 25(110)]
= 2[9350 + 2125 + 2750]
= 2[14225] = 28450 sq cm
Cost of polishing external faces = Rs 0.20 × 28450 = Rs 5690
Given thickness of plank, w = 5 cm
Inner length = l – 2w =110 – 10 = 100 cm
Inner breadth = b – 2w = 85 – 10 = 75 cm
Inner depth = h – 2w = 25 – 10 = 15 cm
Total surface area of inner surfaces = 2[100(75) + 75(15) + 15(100)]
= 2[7500 + 1125 + 1500] = 2[10125] = 20250 sq cm
Cost of painting inner faces = Rs 0.10 × 20250 = Rs 2025
:) Hope this helps !!!
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add the above statement in ur ques and ans
Height = 110 cm, depth = 25 cm and breadth = 85 cm
Total surface area (external) of the shelf = 2(lb + bh + hl) sq units
= 2[110(85) + 85(25) + 25(110)]
= 2[9350 + 2125 + 2750]
= 2[14225] = 28450 sq cm
Cost of polishing external faces = Rs 0.20 × 28450 = Rs 5690
Given thickness of plank, w = 5 cm
Inner length = l – 2w =110 – 10 = 100 cm
Inner breadth = b – 2w = 85 – 10 = 75 cm
Inner depth = h – 2w = 25 – 10 = 15 cm
Total surface area of inner surfaces = 2[100(75) + 75(15) + 15(100)]
= 2[7500 + 1125 + 1500] = 2[10125] = 20250 sq cm
Cost of painting inner faces = Rs 0.10 × 20250 = Rs 2025
:) Hope this helps !!!
PLS SUPPORT SYRIANS LOOK AT THEIR DIFFICULTIES IN GOOGLE
LETS SUPPORT SYRIANS LET THE SUPPORT OF INDIA START FROM US
add the above statement in ur ques and ans
nitthesh7:
Pls mark it as brainliest if it helped u a lot
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