Question

a plastic box 1.5 m long , 1.25 m wide and 65 cm deep is to made . it is opned at the top ignoring the thickness of the plastic sheet determine a) area of the sheet required for making the box . b) the cost of sheet for it if a sheet measuring 1 m squre costs $ 20​

Answer 1

Answer:

a) 1.875m^2

b) 37.5/-

Step-by-step explanation:

Plastic box length = 1.5 m

Plastic box width = 1.25 m

Plastic box depth = 65 cm = 0.65 m

a) Area of the sheet required = plastic box length x plastic box width

                                             = 1.5 x 1.25

                                             = 1.875m^2

∴ The area of the plastic sheet required to make the box is 1.875m^2

b) Cost of the plastic box = ( 1 x 20) 1.875

                                         = 20 x 1.875

                                         = 37.5/-

∴The cost of the plastic sheet is Rs.37.5/-

Answer 2

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

(i) The area of the sheet required for making the box.

(ii) The cost of sheet for it, if a sheet measuring 1m2 costs ₹20.

Answer :-

(i) Here, length (l) = 1.5 m, bread th(b) = 1 .25 m

and height (h) = 65 cm = 65/100 m = 0.65 m

∵ It is open from the top.

∴ Its surface area

= [Lateral surface area] + [Base area]

= [2(1 + b)h] + [lb]

= [2(1.50 + 1.25)0.65] m2 + [1.50 x 1.25] m2

= [2 x 2.75 x 0.65] m2 + [1.875] m2

= 3.575 m2+ 1.875 m2 = 5.45 m2

∴ Area of the sheet required for making the box = 5.45 m2

(ii) Cost of 1 m2 sheet = Rs. 20

Cost of 5.45 m2 sheet = Rs. (20 x 5.45)

= Rs. 109

Hence, cost of the required sheet = Rs. 109

Plz mrk as brainliest ❤