Quantitative Aptitude - Arithmetic Ability Questions

In the following question, select the odd word from the given alternatives.

If cosec 45° - sin 30° = x, then x is

If y=2secθ and x=3tanθ then x29-y24 is

If a+b+c=15 and 1a+1b+1c=71abc, then the a3+b3+c3-3abc is

Which of the following numbers is a perfect square?

Twenty one times of a positive number is less than its square by 100. The value of the positive number is

In a mixture of milk and water, there is 19% milk. If the quantity of milk in the mixture is 437 mililitres, then what is the total quantity (in millilitres) of mixture?

If 192 pens cost is Rs.10, how many pens can be bought for Rs.5?