Ahmed is taking orders for lunch. A slice of pizza cost $2.50 and a chicken sandwich cost $3.50. He collects $21.50 for the group of 7. let x= number of pizza orders. Let y= number of chicken orders.
Assuming each person only orders one item. how many people order the chicken sandwich?

Question

Ahmed is taking orders for lunch. A slice of pizza cost $2.50 and a chicken sandwich cost $3.50. He collects $21.50 for the group of 7. let x= number of pizza orders. Let y= number of chicken orders. 
Assuming each person only orders one item. how many people order the chicken sandwich?

michele_laino · Answer

please, note that, I can mathematize your problem with the system below:
$$2.5x+3.5y=21.5$$
$$x+y=7$$

please solve that system for x, y,  and you will find your answer!