Question

The cost of a pen is Rs 15 less than the cost of a note book. Find the cost of 2 pens and 3 note books, I cost of pen is Rs X.

Answer 1

Answer:

cost of a pen=x

cost of a notebook=y

cost of a pen = cost of a note book-15

x=y-15

y=x+15

cost of 2 pens-

=2x

=2(y-15)

cost of 2 pens= 2y-30

cost of 3 notebooks-

=3y

=3(x+15)

cost of 3 notebooks= 3x+45