SOLUTION: Bob's friend Tim is 4 times as old as he is. Six years from now, Tim will be twice as old as Bob will be. How old is Bob now? Algebra 1.

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Let Bob's age = x
And Tim's age = y
then y=4x because (Tim is 4 times as old as Bob is)
y+6=2(x+6)(Six years from now, Tim will be twice as old as Bob will be)
then
4x+6=2x+12
then
2x=6
x=3
and y = 12
Answer: Bob is 3 years now