Quantitative Aptitude - Arithmetic Ability Questions

In the following question, select the odd letter/letters from the given alternatives.

Product of three consecutive odd numbers is 1287. What is the largest of the three numbers?

If sinA/(1 + cosA) = x, then x is

Find the mean proportional between 2 and 98?

Karteek is twice as good a foreman as Raju and together they finish a piece of work in 20 days. In how many days will Raju alone finish the work?

The average age of 30 boys in a class is 10 years. If the age of their teacher is also included, the average increases by one year. The teacher's age in years is

To get number 40, the number 56/9 should be multiplied with