One fourth of a solution that was 10% sugar by weight was replaced by a second solution resulting in a solution that was 18percent sugar by weight. The second solution was what percent sugar by weight?  Pick.
A) 34%	B) 24%	C) 42%	D) 18%	E) 8.5%
Instead of using complex calculations and remembering formulae, why dont u directly get to weighted average.   3 parts of 10% + 1 part of x (unknown) % = 4 parts of 18%   =&gt; x% = 72%-30% = 42%   ans 42% it is.72 -30= 
<gadget id="calculator">72 -30</gadget>
<output>42</output>
42%   ans 42% it is.
<result>C</result>
One fourth of a solution that was 10% sugar by weight was replaced by a second solution resulting in a solution that was 18percent sugar by weight. The second solution was what percent sugar by weight?