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HINT: The age of each brother is counted a total of three times in the sums above. So what is the sum of the ages of all four brothers?

See Answer

ANSWER: 13.

EXPLANATION: The age of each brother is counted a total of three times in the sums above (each brother is excluded from one of the four sums). So adding the four sums together and then dividing by 3 will give you the combined age of the four brothers. 30 + 32 + 32 + 35 = 129. 129/3 = 43 (the combined age of the four brothers). The lowest sum of the ages above (30) is the one that excludes the oldest brother. So the age of the oldest brother is 43 - 30 = 13!

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