Question 841622
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Hi,
David has two brothers. One brother is two years younger than him 
and the other is five years older than him.
a) Let david be x years old. Sum of their ages:  x + (x-2) + (x+5)
b) x + (x-2) + (x+5) = 39
      3x +3 = 39
          3x = 36
           x = 12
c) What are their ages?  David is 12. Brothers are 10 and 17