Multiple Choice Questions on The ratio of boys and girls in the school is 7 9 when 22 new boys are joined in this school nbs........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

The ratio of boys and girls in the school is 7 9 when 22 new boys are joined in this school nbs...........

Quantitative Aptitude ( CCS) Ratio, Proportion
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    The ratio of boys and girls in the school is 7:9 when 22 new boys  are joined in this school  then the ratio become 9:10.How many girls in this school ?

     

    180
     

    Correct Answer

    200
     

    Incorrect Answer

    160
     

    Incorrect Answer

    220

    Incorrect Answer
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    Explanation:

    7x+22/9x = 9/10
    70x+220 = 81x
    11x = 220
    X =20
    20*9 = 180 girls

    By: Sandeep Dubey
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