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 ?

A merchant changed his trade discount from 25% to 15%. This would increase selling price by

Two buses are moving towards each other with speed of 20 km/hr and 34 km/hr respectively. What will be the distance (in metres) between the two buses one second before they collide?

Manish, Mukesh and Sachin are Accountants. Mukesh can filea return in 5 hours and Sachin in 4 hours alone. All three together can do it in 2 hours. In what time (in hrs) will Manish do the work?

What is the remainder when 6729 is divided by 35?

The mean of 10 observations is 13. Two more observations are included and the new mean becomes 14. The mean of two new observations is

Determine the value of 'x' when 3x3 = 27