Ratios And PercentagesPractice Questions

If the ratio of boys to girls in a school is 7:5 and there are 84 boys, what is the total number of students in the school?

A sum of ₹8400 is divided among A, B, and C in the ratio 2:3:4. If B's share is increased by 20%, what will be the new ratio of A:B:C?

If A:B = 3:4, B:C = 5:6, and C:D = 7:8, then find A:D.

The ratio of efficiency of workers A and B is 5:4. If they work together to complete a job in 10 days, in how many days can A alone complete the same job?

The price of petrol increased by 25%. By what percentage should a person reduce his consumption so that his expenditure remains the same?

The population of a town increases by 10% in the first year and decreases by 20% in the second year. What is the net percentage change after two years?

In an examination, 70% of students passed in Math, 60% passed in Science, and 40% passed in both subjects. What percentage of students failed in both subjects?

Ramesh spends 80% of his income. If his income increases by 25% and his expenditure increases by 20%, by what percentage does his savings increase?

The population of a city is 50,000. If it increases at the rate of 6% per annum, what will be the population after 2 years?

A shopkeeper marks his goods 30% above cost price but allows a discount of 15%. What is his profit percentage?