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Whats wrong with this calculation?

  1. Dec 15, 2016 #1
    1. The problem statement, all variables and given/known data
    Problem in evaluating a single variable equation

    2. Relevant equations
    (10 + x)/ (40+x) * 100 = 60


    3. The attempt at a solution
    (1)

    (10 + x)/ (40+x) * 100 = 60
    1000 + 100x = 2400 + 60x
    100x -60 x = 2400-1000
    40x = 2300
    x= fractional value
    (2)
    However if i solve it using:
    (10 + x) /(40 +x) = 60/100
    (10 + x)/(40 + x) = 3/5
    50 + 5x = 120 + 3x
    2x= 70
    x = 35 (integer value)
    Some body please guide me whats wrong in my first calculation i.e. (1).

    Zulfi.
     
  2. jcsd
  3. Dec 15, 2016 #2

    fresh_42

    Staff: Mentor

    What was 2400-1000 again?
     
  4. Dec 15, 2016 #3

    Mark44

    Staff: Mentor

    2400 - 1000 is not equal to 2300.
     
  5. Dec 15, 2016 #4
    Hi,
    Thanks for solving this burden.

    Zulfi.
     
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