Quantitative Aptitude - Arithmetic Ability Questions

If x+1x = 2, then x2+1x2 = ?

A car travels a certain distance at 24 km/h and comes back at 36 km/h. Find the average speed for total journey.

Mayank, Deepak and Pawan, each of them working alone can complete a work in 5, 10 and 15 days respectively. If all three of them work together to complete a work and earn Rs. 12000 what will be Deepak's share of the earnings?

A can do a piece of work in 9 days while B can do it in 12 days. A and B together can do the work in

If 2x2+2y2=4a the find the value of 2ax2-a+2ay2-a

The average of 10 numbers is X and one of the number is 38. If 38 is replaced with 19, then what will be the new average?

The four sides of a quadrilateral are in the ratio of 2:3:4:5 and its perimeter is 280m. The length of the longest side is

Findout the odd word/letters/number/number pair from the given alternatives.
7 : 50 : : 9 : ?