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Find the sum of the ages of 4 the men

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1 Answer

a + b
a + c
a + d
b + c
b + d
c + d
------
3(a + b + c + d)
 
96 = 90 + 6
79 = 90 - 11
84 = 90 - 6
95 = 90 + 5
100=90 + 10
83 = 90 - 7
       ----------
     6(90) - 3 = 3(a + b + c + d)
 
(a + b + c + d) = 2(90) - 1 = 179

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