The answer of all of this is 18 because 18.1 months so if you do the math you get 18-7x+20^2
Answer:
area of the floor = 540*840.
=453600 cm sq.
area of the marbal piece = 1/2 * 40* 30 = 600 cm sq.
now,
no. of marble piece reqd. = 453600 / 600 = 756 marbal piece.
hope it helps u.
The answer is 3. I hope this help!
30 + 2 = 32