'Two vessels contain equal quantities of 40% alcohol. Sachin changed the concentration of the first

"Two vessels contain
equal quantities of 40% alcohol. Sachin changed the concentration of the
first vessel to 50%\' by. Adding extra quantity of pure alcohol. Vivek changed
the concentration of the second vessel to 50% replacing a certain quantity of
the solution with pure alcohol. By what percentage is the quantity of alcohol
added by Sachin more/less than that replaced by Vivek?
`11 1/9%`
b. `11 1/9%`
c. `16 2/3%`
d. `20 %` more"

first