Question

Ahmed is taking orders for lunch . A slice of pizza costs $2.5 and a chicken sandwich cost $3.5 . He collects $21.5 for the group of 7
Let x= # of pizza orders
Let y = # of chicken sandwich

Answer 1

X divided by y = $17 divided by $21.5

Answer 2

I guess you want to calculate the value of x and y. If so:

Let x= # of pizza orders  & the total cost of the pizza order = 2.5.x
Let y = # of chicken sandwich & the total cost of sandwiches order = 3.5.y

x+y = 7

205x + 36.5y = 21.5

Solving this equation gives:

x=3 (pizza) and 4 (sandwishes)