In a college 12% of all the students are interested in sports, 10% of the total students are interested in singing and three-fourth of the total students are interested in dancing and remaining 15 students are not interested in any activity, How many total students are there in the college?

Joseph's income is decreased by 10%, by what percent the new income has to be increased to bring his income back to the previous level?

The number obtained by subtracting two-third of 75% of 600 from a number is 320, what is the original number?

If the price of petrol is reduced by 10%, by how much should a consumer increase the consumption of petrol so that his expenditure on petrol does not decrease?

When the tax on an article is increased by 20%, its consumption is decreased by 20%. In total tax receipt on this item-

There are two candidates in an election, a candidate gets 71% of the votes and he wins the election by 756 votes, what is the total number of votes?

Atul divides some money among his three children A, B and C. The ratio of amount received by A and C together to the amount received by B is 5:2. C received 150% of the amount received by A. If the amount received by C is Rs. 1500. Find the sum of amount received by A and B together. 

Two students appeared for an examination. One of them secured 24 marks more than the other and his marks were 65% of the sum of their marks. The marks obtained by them are _____ .