The measurement of solution of acid and water in a vessel = 60 Litre Per cent of acid in the solution = 80% The measurement of the acid in the solution =60×
80
100
=48 litres Water in the solution = 60 - 48 = 12 litres. Water to be added in solution is According to the statement,
48
60+x
×100=60 4,800=3,600+60x 4,800−3,600=60x 1,200=60x x = 20 litre So, 20 litres of water is to be added to the solution.