Question

solve the maths sum.​

Answer 1

Answer:

The length of cube= 40cm.

In an open cube, one side is open, so the TSA is $5a^2$ instead of $6a^2$

The TSA or the total surface area of an open cube = $5a^{2}$= Area of metal sheet required.

= 5×40×40= 5×1600= 8000$cm^2$

8000$cm^2$ area of metal sheet is required to make a cube.

The inside and outside of the cube is to be painted.

Then, since each side has to be painted both inside and outside, then each side will be painted twice= 8000*2= 16000$cm^2$

Rate= 10 paise per sq. cm

Cost= 10* 16000= 160000 paise.

160000/100= ₹1600 or 1600 rupees