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 mensuring Im' costs Rs 20,
The length, brendth and height of a room om m​

Answer 1

${\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{Required \: answer}}}}}}}}}}}}}}}}}}$

Length of box = 1.5 m

Breadth = 1.25 m

Height =0.65 m

⇒Area to be white-washed = Area of

cuboid − Area of base.

• Area of sheet required = 2lb+2bh+2lh−lb
• Area of sheet required = 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 = 5.45 m2

ii) Cost of sheet per m

2 area = Rs. 20

Cost of sheet of 5.45m

$\huge{\underline{\red{\mathfrak{♡Answer♡}}}}$

2 area = Rs. 5.45×20

= Rs. 109