Quantitative Aptitude - Arithmetic Ability Questions

Find out the odd word/letters/number pair from the given alternatives

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

If x = 5 + 15 - 1 & y = 5 - 15 + 1, then find the value of x2 - y2.

A boat cover row 12 km upstream in 4 hours and can cover the same distance downstream in 3 hours. What is the speed (in km/hr) of the boat in still water?

What is the area (in square units) of the figure enclosed by the x-axis, the y-axis and the line x + 2y = 6 ?

What are the co-ordinates of the centroid of a triangle, whose vertices are A(-2,5), B(3,-2) and C(5,3)?

A man buys 10 oranges for Rs. 3 and sells 8 for Rs. 3. Calculate his gain percent.

The difference between Peter and Preeti's ages is 5 years. When they married each other 35 years ago, 4 times Peter's age was the same as 5 times the age of Preeti. What is the current sum of their ages?