<PRE><B>Question 159537</B>
1. A person bought some pens and pencils for Rs. 564. If each pen cost Rs.7 and each pencil Rs.3 and the total number of pens and pencils he bought was RS. 108.find the number of each item.
You may edit the question. Maybe convert formulae to the same formula notation 

Let # pens = x
    #pencils = y
7x + 3y = 564  equation(1)
x + y = 108    equation(2)

frome1(2) 
x = 108 - y substituting this in equation(1)
7(108 -Y) + 3Y = 564 
756 - 7Y + 3Y = 564
756 - 4Y = 564
-4Y = 564 -756
- 4Y = - 192
Y = 192/4
Y = 48

ANSWER: NUMBER OF PENCILS= 48
        NUMBERS OF PEN= 60 </PRE>