They are not the same as proportions
20 * 4 = 80 = perimeter of the square 24*2 = 48, the length of two sides of the rectangle. Deducting from 80 we are left with 32 and dividing by 2 we know the rectangle is 24 x 16 Area = L * W, so you can calculate the area of the rectangle.
384
53 is the answer, I think
The number of calculators
= Number of boxes * calculators in each box
=18* 12
= 216 calculators
The answer to your question is b