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7th Class Mathematics Integers Question Bank Integers

  • question_answer
    A deep well has steps inside it. A monkey is sitting on the topmost step (i.e., the first step). The water level is at the ninth step. If the monkey jumps 3 steps down and then jumps back 2 steps up, how many jumps does it have to make to reach the water level?

    A)  \[11\]                                    

    B)         \[9\]

    C)  \[7\]                    

    D)         \[5\]

    Correct Answer: A

    Solution :

       Here jumping downwards is taken as positive and jumping upwards is taken as negative. Also given that the monkey is sitting on the first step. \[1+(+3)+(-2)+(+3)+(-2)+(+3)+(-2)+(+3)+\]\[(-2)+(+3)+(-2)+(+3)+(-2)+(+3)\]                 \[=1+3-2+3-2+3-2+3-2+3-2+3\] is 11 steps.


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