Problema Solution
100% acid solution is to be added to 10% solution to give us 117L of 20% acid
Answer provided by our tutors
Let 'x' represent the amount of 10% solution:
117*0.2=0.1(117-x)+x
x=13
117-13=104
So 104L of 100% acid solution is added to 13L of 10% in order to make 117L of 20% acid solution.