Railways Mathematics Ratio Proportion and Partnership Sample Paper Ratio, Proportion & Partnership Sample Test Paper-6

  • question_answer What least number must be subtracted from each of the numbers 21, 38, 55 and 106 so that they becomes in proportional.

    A)  2                    

    B)  3       

    C)  4        

    D)  5

    Correct Answer: C

    Solution :

    [c] Let number be x \[\therefore \] \[\frac{21-x}{38-x}=\frac{55-x}{106-x}\] \[2226-21x-106x+{{x}^{2}}=2090-38x-55x+{{x}^{2}}\]34x = 136 x = 4 \[\therefore \] The number is 4

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