Answer:
Concepts: Basic Linear Algebra
- X Cartons
- 1 Carton = 12 eggs
- Y Carton
- 1 Carton = 18 eggs
- 72 eggs total
- Hence 12X + 18Y = 72
- To meet your question guidelines:
- 12X+18Y-72=0
we have been asked to solve
0.31 repeating as a fraction
Let
.......(i)

If you multiple the net by 2, you will get 2720, and dividing it from 940, you will get 35%. B is the correct answer. :)
80<2x (x = # of pens)
/2 /2
40<x
39 pens at most