what are the equation for Orly and Perla

Orly's age is 4 years more than thrice Perla's age. Four years ago, Orly was four times as old as Pe...

Orly uses 2 cups of raisins for every 8 cups of trail mix she makes how many cups of trail mix will...

Orly uses 2 cups of raisins for every 9 cups of trail mix she makes. How many cups of trail mix will...