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    Question

    A personโ€™s present age is 4/5th of the age of his

    brother. After 10 years, he will be 9/10thย  of the age of his brother. How old is the brother at present?
    A 35 years Correct Answer Incorrect Answer
    B 25 years Correct Answer Incorrect Answer
    C 40 years Correct Answer Incorrect Answer
    D 10 years Correct Answer Incorrect Answer

    Solution

    Let the brotherโ€™s present age be x years. Then, The personโ€™s present age = 4/5 x โ‡’ 4x/5 + 10 = 9/10(x + 10) โ‡’ 9x/10 โ€“ 4x/5 = 10 - 9 5x/50 = 1 x = 10 Brotherโ€™s age = 10 years.

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