Twice the difference between two numbers is equal to their sum. If one number is 15, find the other number.

If in a triangle, the orthocenter lies on vertex, then the triangle is 

A radio is sold for Rs.900 at 10% profit. If it had been sold for Rs 890, what would have been the actual profit or loss?

A sum of money becomes eight times of itself in 3 years at compound interest. The rate of interest per annum is 

Ramesh scored 73 marks in subject A . He scored 56% marks in subject B and X marks in subject C. maximum marks in each subject were 150. The overall percentage marks obtained by Ramesh in all the three subject together was 54%. How many marks did he score in Subject C?

If $$ {x+{1\over x}}=2$$ then find out the value of $${2x^2+2}\over{3x^2+5x+3}$$

The given pie chart shows the percentage of students enrolled for the courses A, B, C, D and E in a university and the table shows the percentage of students that passed, out of the enrolled students.
Total Students=60,000

How many students passed in Course C?

If there are four lines in a plane, then what cannot be the number of points of intersection of these lines?