2. Questions Bank
  3. 8th Class
  4. Mathematics
  5. Algebraic Expressions

8th Class Mathematics Algebraic Expressions Question Bank Algebra

  • question_answer
    The ratio of number of boys to girls in a class is 1:25. If 36 more girls join, the ratio becomes 1:28. The number of boys in the class is

    A) 24                               

    B) 32                     

    C) 12                   

    D) 48

    Correct Answer: C

    Solution :

    \[\frac{x}{x-1}+\frac{x-1}{x}=2\frac{1}{2}\] (\[(5,4)\] numerator in both rations is same) \[=\sqrt{9\times 49\times {{10}^{-2}}}=\sqrt{{{\left( 3\times 7\times {{10}^{-1}} \right)}^{2}}}\] \[=3\times 7\times {{10}^{-1}}=2.1\]\[x+y=2\]               


You need to login to perform this action.
You will be redirected in 3 sec spinner