SOLUTION: A pot contains salt water mixture. The mixture is 72 gram out of which 18 gram is taken out and 18 gram fresh water is put in its place. Again 18 gram mixture is taken out and 18 g

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Question 973730: A pot contains salt water mixture. The mixture is 72 gram out of which 18 gram is taken out and 18 gram fresh water is put in its place. Again 18 gram mixture is taken out and 18 gram fresh water is put into it. If in the last mixture the salt is 5%, find out the weight of salt in the initial mixture.
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
x, the weight of salt in the initial mixture.
x%2F72 the FRACTION of the salt in the initial mixture.

First adjustment:
%28x-%28x%2F72%29%2A18%29%2F72

Second adjustment:
%28%28x-%28x%2F72%29%2A18%29-%28%28x-%28x%2F72%29%2A18%29%2F72%29%2A18%29%2F72=0.05
Constructing this equation is really the biggest part of solving the problem. Solving the equation is just arithmetic calculation with the use of just one variable. Try carefully multiplying left and right members by 72, simply after each step, and keep this up as necessary until you have no more complex fractions.