Ratio, averages and ages
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- In the exam pattern: Tier-1 (screening test), Numeric Ability: 20 questions, 60 marks (CBSE notice, 13 Nov 2025).
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Take a full mock →Q1 · Ratio, averages and ages · MEDIUM
The ratio of the present ages of Ravi and Sanjay is 4:5. After 10 years, the ratio of their ages will be 6:7. What is Sanjay's present age?
Q2 · Ratio, averages and ages · EASY
A and B invest Rs 20,000 and Rs 25,000 respectively in a business. Both stay in the business for the full year. If the total profit at the end of the year is Rs 18,000, what is B's share in the profit?
Q3 · Ratio, averages and ages · EASY
The average age of 10 students in a class is 15 years. If the teacher's age is included, the average age increases by 1 year. What is the teacher's age?
Q4 · Ratio, averages and ages · MEDIUM
The ratio of the sum of the ages of two brothers to the difference of their ages is 7:1. If the elder brother is 28 years old, what is the age of the younger brother?
Q5 · Ratio, averages and ages · MEDIUM
A 60-litre mixture contains milk and water in the ratio 2 : 1. How much water must be added to make the ratio of milk to water 1 : 2?