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7th Class Mathematics Related to Competitive Exam Question Bank Mathematical Operations

  • question_answer
    DIRECTIONS: In each of the following questions, three statements of numbers following same rules are given. Find the rule and accordingly find the value of the number? If 7*3 = 52; 9*5 = 86; 3*4 = 13, then 5*7 =?

    A) 30                               

    B) 32

    C) 40                               

    D) 57

    E) 42

    Correct Answer: B

    Solution :

        The rule is: \[a*b={{a}^{2}}+b\] \[7*3=49+3=52\,\text{etc}\text{.}\] \[\therefore \]    \[5*7=25+7=32\]


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