In a mixture of 35 litres, the ratio of milk and water is 4:1. If 7 litres of water is added to the mixture, the ratio of milk and water of the new mixture will be

Step 1: Understand the initial mixture

• Total quantity = 35 litres
• Ratio of milk to water = 4 : 1
• Total parts = 4 + 1 = 5
• Milk = (4/5) × 35 = 28 litres
• Water = (1/5) × 35 = 7 litres

Step 2: Add 7 litres of water

New water = 7 (original) + 7 (added) = 14 litres
Milk remains unchanged = 28 litres

Step 3: New ratio of milk to water

Milk : Water = 28 : 14 = 2 : 1

Answer: 2 : 1

After adding 7 litres of water, the new ratio of milk to water becomes 2:1.

This problem teaches how proportions change when new quantities are added to a mixture. It’s a classic mixture and ratio question frequently asked in aptitude exams. By mastering such questions, students can improve their speed and accuracy in competitive test sections related to quantitative aptitude.