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5th Class Mental Ability Arithmetical Reasoning Question Bank Arithmetical Reasoning

  • question_answer
    Patrick has a set of green, white and black marbles.
    ? The green marbles make up exactly \[\frac{1}{2}\] of the set.
    ? The set has 2 black marbles.
    ? The number of white marbles is twice the number of black marbles.
    How many marbles are in Patrick's set?

    A)  6                                

    B)  4

    C)  8                                

    D)  12

    Correct Answer: D

    Solution :

     Number of black marbles = \[\] Number of white marbles \[=\text{ }2\times 2=4\] Total number of black and white marbles \[\text{=4+2=6}\] Total marbles \[\text{(n)=n=}\frac{\text{1}}{\text{2}}\text{ }\!\!\times\!\!\text{ n+6}\]   \[\text{n=2}\times \text{2=12}\] Number of green marbles \[=12\times \frac{1}{2}=6\]


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