Question

A mixture of 150 liters of wine and water contains 20% water. How much more water should be added so that water becomes 25% of the new mixture?

• A. 10 litres
• B. 15 litres
• C. 30 litres
• D. 20 litres

Hint:

Wine quantity stays fixed; only water increases.

Answer 1

The Correct Option is A

Wine quantity never changes since only water is added.
Wine in the original mixture $= 80% \times 150 = 120$ L.
After adding water, water becomes 25%, so wine becomes $100% - 25% = 75%$ of the new mixture.
New total mixture $= \frac{120}{0.75} = 160$ L.
Water added $= 160 - 150 = 10$ L.
\[\boxed{10 \text{ litres}}\]