150 ml of 30% sulphuric acid was added to approximate 400 ml of 12% sulphuric acid solution. Find the approximate concentration of the acid in the mixture?
Choose the most appropriate option
A) 1/2	B) 1/3	C) 1/4	D) 1/6	E) 1/5
150 ml solution contains 45 ml sulphuric acid   400 ml solution contains 48 ml sulphuric acid   Adding   550 ml solution contains 93 ml sulphuric acid   93/550≈90/540=1/6   Answer is 1/6
<result>D</result>
150 ml of 30% sulphuric acid was added to approximate 400 ml of 12% sulphuric acid solution. Find the approximate concentration of the acid in the mixture?