QUESTION IN DESCRIPTION

Question

Natalia and her friends held a bake sale to benefit a local charity. The friends sold 22 cakes on the first day and 15 cakes on the second day of the bake sale. They collected $88 on the first day and $60 on the second day. If they only collect $48 on the third day of the bake sale, then how many cakes did they sell that day?

Answer 1

On first day she sold 22 cakes for $88

On second day she sold 15 cakes for $60

So the price of 1 cake = 88/22 = $4 

This can be also derived the price of 1 cake using 60/15 = $4

So on the third day she earned 48 dollars. so she must have sold 48/4 = 12 cakes

Answer 2

y=4x+0