Question

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 a pencil box. Form the pair of linear
equations for the above situation. Find the cost of
a pen and a pencil box.​

Answer 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