7 L of an acid solution was mixed with 3 L of a 15% acid solution to make a 29% acid solution. Find / 3 the percent concentration of the first solution
Let the percentage of 7 L of acid solution =P 7*P/100 + 0.15*3 =0.29*[7 + 3] 0.07P + 0.45 =2.9 0.07P =2.9 - 0.45 =2.45 P =[2.45 / 7 ] x 100 P = 35 % - Percentage of acid in the 7 L solution.
