1st Class Mathematics Addition and Subtraction Question Bank Addition and Subtraction

  • question_answer 44) How many balls should be crossed 'X' to get 7 balls uncrossed?

    A) 2

    B) 3

    C) 4

    D) 5

    Correct Answer: D

    Solution :

    (d) \[\begin{align} & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\text{T}\,\,\text{O} \\ & \text{Total}\,\text{number}\,\text{of}\,\text{balls}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\text{=}\,\,\text{1}\,\,\,\,\text{2} \\ & \text{Number}\,\text{of}\,\text{Balls}\,\text{that}\,\text{should}\,\text{remain}\,\text{uncrossed}\,\,\,\text{=}\,\,\text{-}\,\,\,\,\,\,\text{7} \\ & \text{Number}\,\text{of}\,\text{Balls}\,\text{should}\,\text{be}\,\text{crossed}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\text{=}\,\overline{\underline{\,\text{0}\,\,\,\,\text{5}}} \\ \end{align}\]

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