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小红 a
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小明 b
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b-(a-b) = 1/3 * a ①
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a+(a-b)= 3 * b-30 ②
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b-a+b=1/3 *a => 2b=4/3a => 4b=8/3a ③
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2a-b=3b-30 => 4b=2a+30 ④
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8/3a=2a+30 => 8/3a-2a=30 =>8a-6a=90 => 2a=90 => a=45
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带回 ③ b=30
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答：小红45岁，小明30岁
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