A mixture contains milk and water in the ratio $7:5$ and has total volume $60$ litres. How much water should be added to make the ratio $1:1$?

Question

A mixture contains milk and water in the ratio $7:5$ and has total volume $60$ litres. How much water should be added to make the ratio $1:1$?

Option A

8 litres

Option B — Correct answer

10 litres

Correct choice.

Option C

12 litres

Option D

15 litres

Explanation

Milk $=\frac{7}{12}\times60=35$ litres and water $=25$ litres. To make the ratio $1:1$, water must also become $35$ litres, so add $10$ litres.

Chapter Mock 10: Mixture and Alligation