Mohan gets 4 marks for each correct sum and losses 1 marks for each wrong sum. He attempted 30 sum and obtains 50 marks. The number of sums solved correctly is? 

In an examination in which full marks were 500. A got 25% more than C, C got 20% less than D. If A got 360 marks. What percentage of full marks was obtained by D ? 

If $$ {66{2\over 3}}{ \%}$$ of 75 % of one-eighth of a certain number is 179, then $$ {33{1\over 3}}{ \%}$$ of three – fourth of that number is:

The hourly wages of a mason have increased by 25%. Since the increase, the number of hours he works daily has reduced by 16%. If he was earning Rs. 120 per day before the increase, how much (in Rs.) is he earning now?

A person spends 40% of his monthly income. The monthly income of the person is increased by 15% and his expenditure is decreased by 22%. What is the approximate percentage increase in his savings?

If the diameter of a wire is decreased by 10% by how much per cent (approximately) will the length be increased to keep the volume constant?

Two numbers are 90 % and 75 % lesser than a third number. By what % should the first number be increased so that it becomes equal to the second number? 

If a batsman scored 120 runs which included 9 boundaries and 3 sixes, then what percent of his total score did he make by running between the wickets?