Quantitative Aptitude - Arithmetic Ability Questions

The average weight of 30 students in a class is 25 kgs. If the weight of the class teacher is added, the average weight increase by 2 kgs. The weight of the class teacher in kgs is

If x/2 - [4(15/2 - x/3)]/3 = -x/18, then what is the value of x?

Which of the following is not a Triangular number?

Rearrange the jumbled up letters in their natural sequence ad find the odd one out.

Compute 33800/520/5

Select the odd word/letters/number/number pair from the given alternatives.

What is the value of (1 + cotA)2 + (1 -­ cotA)2?

If x -­ y = ­7 and x + y = 13, then x2 - y2 is