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A plastic box 1.5 m long, 1.25 m wide and 65 cm deep is to be made. It is opened at the top. Ignoring the thickness of the plastic sheet, determine:
(i) The area of the sheet required for making the box.
(ii) The cost of sheet for it, if a sheet measuring 1 costs Rs. 20.
Asked by Laxmi Last Modified
Answer
L=1.5m, B=1.25m, H=65cm=0.65m
(i) area of sheet required=area of base+area of four sides
=L×B+2(L×H+B×H)
=1.5×1.25+2(1.5×0.65+1.25×0.65)
=1.875+2(0.975+0.8125)
=1.875+2(1.7875)
=1.875+3.575
(ii) Cost of sheet per m2 area =
area of sheet required×cost of sheet
=5.45×20
=Rs. 109
read lessANS OF PART 1
According to question
L= 1.5 Mt, W=1.25 Mt D= 0.65 Mt
Total surface area without top = 2* D* (W+L)+ L* W
= 2*0.65*(1.5+1.25)+1.5*1.25 SQ. MT.
=1.3*2.75+1.875 SQ.MT.
=3.575+1.875 SQ.MT.
=5.45 SQ.MT.
ANS of part 2
Sheet rate per sq Mt is Rs. 20
Then total cost of sheet = 5.45 * 20
= Rs. 109
read less
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