InterviewSolution
Saved Bookmarks
| 1. |
An 80 litre mixture of water and acid contains 20% acid. How much acid should be added to make the acid 60% in the new mixture?1). 602). 803). 704). 90 |
|
Answer» LET the quantity of new mixture is ‘a’ litres ACID in the mixture = 20% of 80 LITRE = 16 litres Water in the mixture = 80 – 16 = 64 litres = 80% of the mixture In new mixture water is only 40% and acid is 60% Water in new mixture = 40% of a litres = 64 litres ⇒ 2/5 × a = 64 litres ⇒ a = 160 litres Acid in new mixture = 160 – 64 = 96 litres = 60% of the new mixture ∴ Acid that should be added = 96 – 16 = 80 litres |
|