Question

A bookstore sells two types of pens, P and Q.Two pen boxes and 3 penQ boxes cost RM14.00 while 6 pen boxes and 5 penQ boxes cost RM30.00.

find the price, in RM, of each pen box.

Answer 1

Answer:

Let the cost of a pen and a pencil be x and y respectively.

4x+4y=100

x+y=25 ...(1)

3x=y+15

3x−y=15 ...(2)

Adding (1) and (2), we get

4x=40

x=10

Substitute x=10 in equation (1) to get y=15.

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