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7th Class Mathematics Simple Equations Question Bank Simple Equation

  • question_answer
    Sum of two numbers is 45. One is twice the other. (a) If smaller number is l, find the other number.                       (b) Find the equation formed. (c) Find the numbers.

    A)
    (a) (b) (c)
     \[2l\] \[l+2l=45\] \[10,35\]
                   

    B)       
    (a) (b) (c)
     \[2l\] \[l+2l=45\] \[15,30\]
                   

    C)       
    (a) (b) (c)
     \[l+2\] \[45+l+2=l\] \[15,30\]

    D)       
    (a) (b) (c)
     \[ll2\] \[45+l/2-l=0\] \[25,20\]

    Correct Answer: B

    Solution :

              First number = l Second number = 21 According to question, \[l+2l=45\Rightarrow 3l=45\Rightarrow 1=15\] So, numbers are 15, 30.


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