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  3. 4th Class
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  5. Arithmetical Reasoning

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


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