



 
Suppose Aaron is $A$ years old and Bill is $B$ years old. Since Aaron is 4 times as old as Bill \[A = 4 \times B.\] In 10 years how old will Aaron be? How old will Bill be? At this time Aaron will be twice as old as Bill. This gives you a second equation in $A$ and $B.$ Can you solve the pair of equations for $B?$ Make sure you verify your answer. Write back if you need more assistance, 



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