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7th Class Mathematics Comparing Quantities Question Bank Comparing Quantities

  • question_answer
    Two numbers are in the ratio\[3:5\]. If each number is increased by 10, the ratio becomes\[5:7\]. The numbers are ____,

    A)  3, 5                            

    B)  7, 9                

    C)         13, 22         

    D)         15, 25

    Correct Answer: D

    Solution :

    Let the numbers be 3x and 5x.         Then \[\frac{3x+10}{5x+10}=\frac{5}{7}\] or \[7(3x+10)=5(5x+10)\] \[\therefore \]  \[4x=20\]or \[x=5\] So, the numbers are 15, 25.


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