Quantitative Aptitude - Arithmetic Ability Questions

If x - 2y = 2 and 3x + y = 20, then the value of (x,y) is

What is the value of S = 11x3x5 + 11x4 + 13x5x7 + 14x7 + 15x7x9 + 17x10 + ... upto 20 terms. Then what is the value of S? 

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

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

On dividing 221a2b2 by 13b2, we get _____.

In the following question, select the related number from the given alternatives.
 
47 : 57 : : 93 : ?

The number of students in a class is increased by 20% and the number now becomes 66. Initially the number was

The diagonal of a square is equal to the side of an equilateral triangle. If the area of the square is 15√3 sq cm, what is the area of the equilateral triangle?