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

  • question_answer In a school, the ratio of boys to girls is 4 : 5. When 100 girls leave the school, the ratio becomes 6 : 7. How many boys are there in the school?

    A)  1600   

    B)  1500

    C)  1300               

    D)  None of these

    Correct Answer: D

    Solution :

    [d] Let number of boys = 4x Number of girls = 5x \[\therefore \] \[\frac{4x}{5x-100}=\frac{6}{7}\] \[30x-600=28x\] \[2x=600\] \[x=300\] Number of boys \[=4\times 300=1200\]

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