Quantitative Aptitude - Arithmetic Ability Questions

The LCM of 14, 21 and 35 is

If 2sec2x - tan2x = 5 and 0° ≤ x ≤ 90°, then x = ?

What is the value of (cos30° + 1/2) ?

If the volumes of two right circular cones are in the ratio 1:4 and their diameters of bases in the ratio 4:5, then their heights will be in the ratio:

In a class of 39 students there are 36 girls. The average weight of these girls is 38 Kg and average weight of the full class is 40 kgs. What is the average weight of the boys of the class?

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

How many numbers less than 200 are multiples of both 5 and 6?

If Sinx = 4/5, then Secx/Sinx = ?