14
0.3. The cost of 4 pens and 4 pencil boxes is * 100.
Three times the cost of a pen is * 15 more than
the cost of

1 thought on “14<br />0.3. The cost of 4 pens and 4 pencil boxes is * 100.<br />Three times the cost of a pen is * 15 more than<br />the cost of”

1. Answer:

   4x+4y=100

   x+15=y

   after substituting,

   8x+60=100,

   8x=40,

   x=5,

   y=20,

   cost of pen is 5 ,And cost of pencil box is 20

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