Question

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: ) The area of the sheet required for making the box. )The cost of sheet for it, if a sheet measuring Im' costs Rs 20.​

Answer 1

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Length of box= 1.5 m, height =0 . 65

=> Area to be white washed = Area of cuboid - Area of base.

I) area of required sheet = 2lb+ 2bh+ 2lh- lb

I) are of required sheet = 2lh+ 2bh+ lb.. [box is open]

= [2×1.5×0.65+2×1.25×0.65+1.5×1.25] m^2

= (1.95+1.625+ 1.875) m^2= 5.45m^2

ii) cost of sheet per m^2area = Rs. 20.

Cost of sheet of 5.45m^2 area = Rs. 5.45 ×20

= Rs. 109.

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Hope it helped✌️

Answer 2

Given: A plastic box 1.5 m long, 1.25 m wide and 65 cm deep. It is opened at the top. ... Therefore, the area of the sheet required for making the open box is 5.45 m² and the cost of the sheet is ₹109.