Quantitative Aptitude - Arithmetic Ability Questions

If 23x + 23y = 184, then what is the average of x and y?

If xy = -30 and x2 + y2 = 61, then find the value of (x + y).

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

If a+b=2c then the value of aa-c+cb-c is equal to (where a≠b≠c)

A store sells a watch for a profit of 25% of the cost. Then the percentage of profit against selling price is

Ram is 20 years younger than Shyam. 5 years ago, the ratio of their age was 3:5. The sum of their present age is

The sum of length, breadth and height of a cuboid is 22 cm and the length of its diagonal is 14 cm.
If S is sum of the cubes of the dimensions of the cuboid and V is its volume, then what is (S-3V) equal to?

The standard deviation of the set {10, 11, 9, 11, 9} is