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    Rohan's present age is 37\frac3773​​ times of the age of his mother. After five years, he will be one- half of the age of his mother. How old is his m
    Question

    Rohan's present age is 37\frac37​ times of the age of his mother. After five years, he will be one- half of the age of his mother. How old is his mother at present ?

    A.

    31 years

    B.

    33 years

    C.

    35 years

    D.

    37 years

    Correct option is C

    Given:

    Rohan's present age =37 \frac{3}{7}​ times his mother's present age.

    After 5 years, Rohan will be half of his mother's age.

    Solution:

    Let Rohan's present age be R and his mother's present age be M .

    From the given information:
    R = 37×M(Rohan’s present age in terms of his mother’s age).\frac{3}{7} \times M \quad \text{(Rohan's present age in terms of his mother's age)}.​​
    After 5 years:
    R + 5 = 12×(M+5).\frac{1}{2} \times (M + 5).​​

    Using the first equation, substitute R =37× \frac{3}{7} \times ​M  into the second equation:

    (37×M)+5=12×(M+5). 2(37×M+5)=M+5. 67×M+10=M+5. 67×MM=5. (671)×M=5, 17×M=5.\left(\frac{3}{7} \times M\right) + 5 = \frac{1}{2} \times (M + 5). \\ \ \\2 \left(\frac{3}{7} \times M + 5\right) = M + 5.\\ \ \\\frac{6}{7} \times M + 10 = M + 5.\\ \ \\\frac{6}{7} \times M - M = -5.\\ \ \\\left(\frac{6}{7} - 1\right) \times M = -5,\\ \ \\\frac{-1}{7} \times M = -5.

    M = 35.

    Thus, Rohan's mother is 35 years old at present.

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