CSAT (Aptitude)·Prelims Questions

Average and Mixtures — Prelims Questions

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Version 1Updated 10 Mar 2026

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Q1easy

The average age of 30 students in a class is 15 years. If the age of the teacher is included, the average age increases by 1 year. What is the teacher's age?

Q2medium

A container has 60 litres of milk and water in the ratio 3:2. 10 litres of the mixture are removed and replaced with 10 litres of water. What is the new ratio of milk to water in the container?

Q3medium

A person travels from point A to point B at a speed of 30 km/h and returns from point B to point A at a speed of 20 km/h. What is the average speed for the entire journey?

Q4medium

In a class, the average marks of 40 boys is 60, and the average marks of 20 girls is 75. What is the average marks of the entire class?

Q5easy

A sum of money is distributed among 10 persons. If the average amount received by the first 4 persons is ₹150, and the average amount received by the remaining 6 persons is ₹200, what is the average amount received by all 10 persons?