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? 

Aman's expenses are 30% more than Vimal's expenses and Vimal's expenses are 10% less than Raman's expenses. If the sum of the expenditure of all three is Rs. 6,447, then what is the Expenditure of Aman?

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 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?

A student got 30% marks in an examination and failed because he got 12 marks less. Another student got 40% marks in the same examination and got 18 marks more than the minimum passing marks. Must have marks to pass

A student scored 32 percent and failed by 8 Marks. If he had scored 36 percent marks, he would have passed by 2 marks. What is the passing score?

A book seller allowed 10 % discount on printed price. He gets 30 % commission from publisher. His profit in percent will be? 

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?