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Homework Statement
If ADD = 9
BAD = 7
CAD = 8
Find ADA .
Homework Equations
Algebra
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 ?