Question

How do I set up this proportion?
If it costs $12 to buy 5 pounds of grapes, how much will you have to pay to buy 9 pounds?

Answer 1

12 is to 5, as "what" is to 9?

Answer 2

12:5 :: x:9

Answer 3

Can you explain though. I am having trouble with proportions.

Answer 4

do you know how to cross multiply?

Answer 5

Yes.

Answer 6

thats all this is ...

\[\frac{12}5=\frac x9\]

Answer 7

That is how you set up the proportion?

Answer 8

yep

notice that 12 is to 5, as x is to 9

Answer 9

So, Kelly makes $80 for working a 3-hour shift at a restaurant. If she made $210, how many hours did she work?

80/3 = 210/x ?