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 put in its place.again 18 gram mixture is taken out and 18 gram

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Question 945828: a pot contains salt water mixture. the mixture is 72 gram out of which 18 gram is taken out and 18 gram fresh water 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%,findout the weight of salt in the initial mixture.
Answer by josgarithmetic(39615) About Me  (Show Source):
You can put this solution on YOUR website!
Very few steps than to look for a pattern.

Analyze the two steps.

p, initial percentage AS a fraction, weight per weight.

STEP 1:
%2872%2Ap-18%2Ap%29%2F72, the fraction of the resulting solution as salt.

STEP 2:
(72()-18())/72=0.05, as pure text before substituting the starting concentration FOR THIS STEP;
%2872%28%2872%2Ap-18%2Ap%29%2F72%29-18%28%2872%2Ap-18%2Ap%29%2F72%29%29%2F72=0.05

Can you continue with that equation and solve for p?
(Remember, I am using p as a decimal fraction.)