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9th Class Mathematics Number System and its Operations Question Bank Number System

  • question_answer
    A boy has enough money to buy 20 exercise books. If each book cost 25 paise less, he could buy two more books and still have 70 paise left. How much money had he originally?

    A) 45                      

    B)        48

    C) 50                        

    D)        52

    E)  None of these

    Correct Answer: B

    Solution :

    Explanation Option [b] is correct. Let the original price of each book = Rs. x \[\therefore 20x=22\left( x-\text{ }0.25 \right)+0.70\] \[\Rightarrow 2x=4.8\Rightarrow x=Rs.\,2.4\] \[\therefore He\text{ }had\text{ }20\times 2.40=Rs.\text{ }48\]


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