Two vessels contain milk and water in the ratios 9 : 7 and 5 : 11. If the contents of the two vessels are mixed in the ratio 1 : 1 by volume, find the ratio of milk to water in the new mixture.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 7 : 9
Both ratios have 16 parts in all (9 + 7 and 5 + 11), so equal quantities of the two mixtures can be added part by part.
Take 16 litres of each
Milk \(=9+5=14\) litres, water \(=7+11=18\) litres
Milk : water \(=14:18=7:9\)
The ratio of milk to water is 7 : 9.