Quantitative Aptitude - Arithmetic Ability Questions

What is the value of cos2A/(1 + sinA)?

Select the odd letters from the given alternatives.

If cos 240° = x, then value of x is

A telephone bill costs Rs.13 for 19 minutes. What is the cost in rupees for 15 minutes 50 seconds?(rounded to one decimal)

If on an item there is 12% discount on the marked price of Rs 10,000 but the item is sold at Rs 8,360 only then what additional discount (in %) did the customer get?

If 5/6th of 7/6th of a number is 140, then 9/4th of that number is

In a test, Charan secured 54 marks that was also equivalent to obtaining 72% marks. How many marks was the test out of?

If [√(a2 + b2 + ab)] + [√(a2 + b2 – ab)] = 1, then what is the value of (1 – a2 )(1 – b2 )?