John has $175 in $5 and $10 bills in his drawer. The number of $5 bills is three times the number
of $10 bills. How many of each are
in the drawer?

Tomas used 3 1/3 cups of flour and now has 1 2/3cups left. which equation can he use to find f, the number of cups of flour he had to begin with? f+3 1/3=1 2/3 f-3 1/3=1 2/3 3 1/3f=1 2/3 f/3 1/3=1 2/3