6. Ten years ago, A's age was half of B's age. If the ratio of their present ages is 3 : 4, what will be the sum of their present ages? please explain by full method.
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Answer: If the ratio of their present ages is 3 : 4, what will be the total of their present ages.
=> x = 5. = (3x + 20) = 35 years.
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