A.

b.

e.
Let the number be x

Others I am not really sure.
72/(7+5)
72/12 = 6
6 * 7 = 42
Mahesh receives $42
If one side is 3 inches, the perimeter would be 5x3 which is 15. In terms of algebra, if one side is y, then the perimeter is 5y.
Multiply 3 by 265 and you have your answer 768