Quantitative Aptitude - Arithmetic Ability Questions

What is the Number of candidates who had applied if the ratio of selected to unselected was 14 : 25. If 35 less had applied and 10 less selected, the ratio of selected to unselected would have been 3 : 5?

What is the value of [cos (90 + A)÷sec (270 – A)] + [sin (270 + A)÷cosec (630 – A)]?

If (1/x) + (1/y) + (1/z) = 0 and x + y + z = 9, then what is the value of x3 + y3 + z3 – 3xyz?

The ratio of three numbers is 2 : 3 : 5. If the sum of the three numbers is 275, then what is the largest among the three numbers?

From a point, 40 m apart from the foot of a tower, the angle of elevation of its top is 60°. The height of the tower is

A man walks at a speed of 3 kmph. He doubles his speed after reaching exactly half way. He walks for 5 hours in all. What is the total distance travelled by him?

P and Q can do a project in 60 and 30 days respectively. In how many days can they complete 90% of the project if they work together?

If 6/7th of 8/5th of a number is 192, then 3/4th of that number is _____.