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8th Class Mathematics Related to Competitive Exam Question Bank Arithmetic

  • question_answer
    If the rent for grazing 40 cows for 20 days is Rs.370, how many cows can graze for Rs.111 for 30 days?

    A) 60                         

    B) 8

    C) 25                         

    D) 30

    Correct Answer: B

    Solution :

    Rent No. of No. of
    (in Rs.) days cows
    370 20 40
    111 30 x
    Rent is in inverse variation with number of days but rent is indirect variation with number of cows \[{{a}_{1}}:{{a}_{2}}::{{b}_{2}}:{{b}_{1}}\] \[8\times 32=256,16\times 16=256,32\times 8=256\]


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