729 ml of a mixture contains milk and water in the ratio 7:2. How much of the…
2023
729 ml of a mixture contains milk and water in the ratio 7:2. How much of the water is to be added to get a new mixture containing half milk and half water ?
- A.
81 ml
- B.
405 ml
- C.
972 ml
- D.
910 ml
Attempted by 14 students.
Show answer & explanation
Correct answer: B
Step 1: Find one part value. Total parts = 7 + 2 = 9, so one part = 729 ÷ 9 = 81 ml.
Milk = 7 × 81 = 567 ml.
Water = 2 × 81 = 162 ml.
Step 2: Determine water to add. To make milk and water equal, final water must be 567 ml, so add 567 − 162 = 405 ml of water.
Answer: 405 ml