15 litres of a mixture contains 20% alcohol and the rest

Home » Aptitude » Ratio, Proportion » Question

15 litres of a mixture contains 20% alcohol and the rest water. If 3 litres of water be mixed in it. The percentage of alcohol in the new mixture will be ?

1. 17
2. 16²/ ₃
3. 18¹/ ₂
4. 15

Correct Option: B

Alcohol = (20/100) x 15 litres = 3 litres,
Water = 12 litres
New mix, contains,
Alcohol = 3 litres,
Water = 15 litres

∴ Percentage of alcohol in new mix. = (3/18) x 100 % = 16²/ ₃%