Quantitative Aptitude - Arithmetic Ability Questions

Which of the following ratios can be the ratio of the sides of a right angled triangle?

If 1+y16-74, then the value of 5y-15

If a+1a=1,then the value of a2-a+1a2+a+1 is a≠0

PT is a tangent to a circle with centre O and radius 6 cm . If PT is 8 cm then length of OP is

Two pipes X and Y can individually fill a tank in 48 and 72 min respectively. If they are opened simultaneously, how long will it take for the tank to fill? 

If a + b = 10 and ab = 24, then the value of a3 + b3 is

The length of a chord which is at a distance of 12 cm from the centre of a circle of radius 13 cm is

A = (x8 – 1)/(x4 + 1) and B = (y4 – 1)/(y2 + 1). If x = 2 and y = 9, then what is the value ofA2 + 2AB + AB2?