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7th Class Mathematics Comparing Quantities Question Bank Self Test-7

  • question_answer
    The monthly income of \[x\]and \[y\] are in the ratio of 4 : 5 and their monthly expenditure are in the ratio 7 : 9. If both save $ 100 per month then monthly expenditure of \[x\] will be:

    A)  $800       

    B) $700        

    C)  $900       

    D)  $200

    E)             None of these

    Correct Answer: C

    Solution :

    Income of \[x=4x\]and income of \[y=5x\] Expenditure of \[x=7y\]and expenditure of \[y=9y\] \[\Rightarrow 4x-7y=100\] \[\Rightarrow 5x-9y=100\]


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