Quantitative Aptitude - Arithmetic Ability Questions

If cosπ/4c - tanπ/4c = x, then x is

The slopes of two lines are 1 and √3. What is the angle between these two lines?

Average of the height of 251 students of a school is 48. If the average of the height of the boys is 51 and the average of the height of the girls is 29, then what will be the ratio of the total height of boys and the total height of girls respectively?

Rohan sells two articles. The cost price of the first article is equal to the selling price of the second article. The first article is sold at a profit of 40% and the second article is sold at a loss of 40%. What is the ratio of the selling price of the first article to the cost price of the second article?

What is the highest common factor of 360 and 450?

What is the compound interest on Rs. 48,000 for 2 years at 20% p.a., if interest is compounded annually?

If the selling price of an item is Rs 9750 after getting a discount of 25%, then what was its marked price (in Rs)?

If u+v = 10 and uv = 16, then find the value of u2-v2uv