Quantitative Aptitude - Arithmetic Ability Questions

If x + 1/x = √13, then 3x(x2-1) equal to

If x - y = 6 and xy = 40, then find x2 + y2 ?

If 7x + 6y = 5xy and 10x ­- 4y = 4xy, then value of x and y is

Select the odd letters from the given alternatives.

In the given figure, AB, AE, EF, FG and GB are semicircles. AB = 56 cm and AE = EF = FG = GB. What is the area (in sq.cm) of the shaded region?

Keerthana takes 9 hrs 20 min in walking a distance and riding back to same place where she started. She could walk both ways in 11 hrs 15 min. The time taken by her to ride back both ways is

A boy in a train notices that he can count 31 telephone posts in 60 seconds. the distance between two posts is 60 meters. Calculate the speed of the train?

Two trains start from a certain place on two parallel tracks in the same direction. The speed of the trains are 45 Km/hr and 40 Km/hr respectively. The distance between the two trains after 45 minutes will be