A recipe calls for 2 cups of peanut butter for every 3 1/4 cups of flour how many cups of flour will be need for 5 cups of peanut butter

Why does this sound like homework to me?

What formula are you using to figure this out?

AMHD doesn't do homework.

Not homework just wanting ot use the 5 cups of peanut butter but did not know how much flour to use

I won't actually do your homework for you, but will ask you some questions that might help to it yourself.
First, how many 2cups are there in 5 cups?
Second, after finding that out, 2 cups of peanut butter is used with 3 1/4 cups of flour, so
Figure out how many cups of flour will be needed for the First answer!