A sample of 15 litres of Bacardi is found to be adulterated to the extent 10%. How much pure Bacardi should be added to bring up the level of purity to 95%
This one had me a little confused at first also.
But this is how I cracked it:
.10 is impure, so .90(15) is pure Bacardi. ie 13.5 litres.
Let x equal amount of pure Baca to be added.
(13.5 + x)/(15 + x) = 95/100
1425 + 95x = 1350 + 100x
75 = 5x
15 = x
Pls include reasoning along with all answer posts.
Este examen me conduce jodiendo loco