Quantitative Aptitude - Arithmetic Ability Questions

In the following question, select the odd word pair from the given alternatives.

Reflection of the point (3,-6) in the y-axis is

2sin[(C+D)/2].cos[(C­-D)/2] is equal to

If the Arithmetic mean of 7, 5, 13, x and 9 is 10, then the value of x is

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

A person bought an item for Rs. 1500 and sold it at a profit of 12%. What was the selling price of the item?

Vikash purchased 5 bananas for Rs.4 and sold 4 bananas for Rs.5. Calculate his % profit?

Two valves P and B can fill a sump in 37.5 minutes and 45 minutes respectively. Both valves are opened. The sump will be filled in just 30 minutes, if valve B is turned off after