Quantitative Aptitude - Arithmetic Ability Questions

If a cylinder of radius 4.3 cm and height 4.8 cm is melted and constructed into a cone of the same radius, what will be the height of this cone? (Use π = 22/7)

If a+bab=21 ,  then the value of (a-b) is

A train left 1 hour later than the scheduled time but in order to reach its destination 200 km away in time, it had to increase its usual speed by 10 km/hr. What is the usual speed (in km/hr) of the train?

If 169 is subtracted from the square of a number, then the result obtained is 7056. What is the number?

If θ be positive acute angle and 5cosθ + 12sinθ = 13, then the value of cosθ is

If 2x-2x=1 (x≠0),then the value of x3-1x3 is

If X+Y=3,XY=2, find the value of X3-Y3

While selling a watch, a shop-­keeper gives a discount of 5%. If he gives a discount of 7%, he earns Rs.15 less as profit. The marked price of the watch is