Quantitative Aptitude - Arithmetic Ability Questions

In 250 litres mixture of soda and water the ratio of amount of soda to that of water is 7 : 18. In order to make this ratio 2 : 3, how many more litres of soda should be added?

Select the odd word/letters/number/number pair from the given alternatives.

The area of the circle with radius Y is W. The difference between the areas of the bigger circle (with radius Y) and that of the smaller circle (with radius X) is W'. So x/y is equal to

If P = 99, then the value of P(P2+ 3P + 3) is

If cosπ/4c - tanπ/4c = x, then x is

If √(1 - cos2A)/cosA = x, then the value of x is

If 1/√(cosec2A - 1) = x, then value of x is

56% of 250 is