Ratio, proportion, averages and ages
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- In the exam pattern: First Stage Computer Based Test (CBT-I), Mathematics: 30 questions, 30 marks (RRB notice, 13 Aug 2026).
- Next exam day: CBT-II exam (expected): 15 Feb 2027 (Expected — an estimate, not announced).
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Take a full mock →Q1 · Ratio, proportion, averages and ages · EASY
The ratio of the ages of Arjun and Bhaskar is 4:5. If the sum of their ages is 36 years, what is Arjun's age?
Q2 · Ratio, proportion, averages and ages · MEDIUM
Three friends A, B and C invest Rs 4,000, Rs 5,000 and Rs 6,000 respectively in a business. If the total profit after one year is Rs 3,000, what is B's share of the profit?
Q3 · Ratio, proportion, averages and ages · MEDIUM
The average age of 25 students in a class is 18 years. If the teacher's age is included, the average age increases by 1 year. What is the teacher's age?
Q4 · Ratio, proportion, averages and ages · HARD
A and B start a business with a ratio of capital 3:2. After 6 months, C joins with a capital equal to the sum of A and B's capitals. If the total profit at the end of the year is Rs 1,500, what is C's share?
Q5 · Ratio, proportion, averages and ages · MEDIUM
Two numbers are in the ratio 3 : 5. If 9 is added to each number, the ratio becomes 3 : 4. What is the smaller number?