If Sam buys 14 water bottles, he will have spent 18.9, so when you subtract 20 (the limit) from 18.9 (how much money he'll spend on the water bottles) you get 1.1
This is probably way overcomplicated but i cant remember how to do it w = n l = 2n+1 w*l = 66 n(2n+1) = 66 2n^2 + n =66 2n^2 + n - 66 = 0 using quadratic equation
