Quantitative Aptitude - Arithmetic Ability Questions

If p/q = r/s = t/u = √5, then what is the value of [(3p2 + 4r2 + 5t2)/(3q2 + 4s2 + 5u2)]?

What will come in the place of question mark (?) in the following question (You do not have to calculate the exact value)?

24.97% of 84.01 ÷ 6.995 = ?

The third proportional of two numbers 9 and 24 is

At 15% discount the selling price of a microwave oven is Rs 34000, what is the selling price if the discount is 37.5%?

The marked price of an article is Rs. 5000. But due to a special festive offer a certain percent of discount is declared. Mr. X availed this oppurtunity and bought the article at reduced price. He then sold it at Rs. 5000 and thereby made a profit of 11 1/9%. The percentage of discount allowed was?

Rs. 782 is divided into 3 parts in the ratio 12:23:34, the first part is 

In a class, average height of all students is 'a' cms. Among them, average height of 10 students is 'b' cms and the average height of the remaining students is 'c' cms. Find the number of students in the class. (Here a>c and b>c )

When a number is increased by 24, it becomes 110% of itself. What is the number?