Question

A person spent ₹564 in buying pens and pencils if cost of each pen is ₹7 and each pencil is ₹3 and if the total number of things bought was 108, how many of each type did he buy?

Answer 1

7x+3y=564.....i
x+y=108....ii
Multiply 2nd equation by 3
3x+3y=324....iii
From eq.i &iii
x=60;y=48