1. The problem statement, all variables and given/known data The number of coins in Bill's collection is 80 less than twice the number in Gina's collection. Who has more coins? The answer is "Not enough information to answer the question." 3. The attempt at a solution The way you do these problems is figure out the equation then plug in different numbers. If you get two different answers it means the info you've been given is not enough to get an answer. I just can't figure out how to make an equation. Could anybody explain in words how they come up with an equation to match that information?