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7th Class Mental Ability Mathematical Reasoning Question Bank Mathematical Reasoning

  • question_answer
    If\[\text{11  }\!\!\times\!\!\text{  12  }\!\!\times\!\!\text{  13 = 234}\], \[\text{24 }\times \text{ 23 }\times \text{ 35 = 658}\], then \[\text{31  }\!\!\times\!\!\text{  43 }\times \text{ 54 = ?}\]

    A)  497                       

    B)         974

    C)  749                                       

    D)  479  

    Correct Answer: D

    Solution :

     \[11\times 12\times 13=(1+1)(1+2)(1+3)=234\]and \[24\times 23\times 35=(2+4)(2+3)(3+5)=658\] Similarly,\[31\times 43\times 54=(3+1)(4+3)(5+4)=479\]


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