1. The problem statement, all variables and given/known data If ADD = 9 BAD = 7 CAD = 8 Find ADA . 2. Relevant equations Algebra 3. The attempt at a solution ADDBAD=9*7 BADCAD=56 ADABCC= 56*8/9 B/C = 7/8 I really don't know how to approach this problem, what must I eliminate and how should I do it ?