Quantitative Aptitude - Arithmetic Ability Questions

What is the unit place digit in the expansion of  773?

60% of P = 50% of Q and Q = x% of P. What is the value of x?

A shopkeeper by selling 9 Rolex watches, earns a profit equal to the selling price of 4 Rolex watches. His profit percentage is

A bus runs at 50 kmph. If the speed is increased by 10 kmph, it will cover 20 km more in the same time. Find the actual distance covered?

Find the unit place digit in 71 x 72 x 73 x 74 x 76 x 77 x 78 x 79.

Two numbers are 35% and 50% lesser than a third number. By how much percent is the second number to be enhanced to make it equal to the first number? 

If 1 + secA = x, then the value of x is

PQR is a right angled triangle in which PQ = QR. If the hypotenuse of the triangle is 20 cm, then what is the area (in cm2) of the triangle PQR?