Question 1023281
Sergio is five times as old as Abby.  Lino is twice as old as Abby.  Abby is twelve years younger than Lino.  How old is Sergio?
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S = 5A
L = 2A
L = A + 12
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L = 2A
L = A + 12
2A = A + 12
A = 12
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S = 5A
Sergio is 60.