Question

Lionel sold at $10.70 each and 15 pens at $2.10 each during a sale. Janet sold the same number of balls at $11.20 each and 15 pens at $1.90each. They collected the same amount of money. How many ball did each of them sell?

Answer 1

Let the number of ball be x.

10.7x+15(2.1)=11.2x+15(1.9)
31.5=0.5x+28.5
0.5x=3
x=6

Therefore each of them sell 6 balls.

Hope it helps, have a nice day : )