Quantitative Aptitude - Arithmetic Ability Questions

If Sec θ = 5/3, then what is the value of Cosec θ?

What is the value of (cos 40° – cos 140°)/(sin 80° + sin 20°)?

What is the average of all numbers between 9 and 90 which are divisible by 8?

If P = 7 + 4√3 and PQ = 1, then what is the value of 1/P2 + 1/Q2?

If 21% of an electricity bill is discounted, Rs 1817 is still to be paid. How much was the original bill amount?

The cost price of an article is x. It is marked up by 150%. It is sold at Rs 600 after giving 40% discount. What is x (in Rs)?

What is the value of (91 + 92 + 93 + ......... +140)?

P is a point outside the circle at distance of 6.5 cm from centre O of the circle. PR be a secant such that it intersects the circle at Q and R. If PQ = 4.5 cm and QR = 3.5 cm, then what is the radius (in cm) of the circle?