Quantitative Aptitude - Arithmetic Ability Questions

If (sinA + CosA)/(sin A - cos A) = 5/4, the value of (tan2A + 1)/(tan2A - 1) = ?

If cos 2π/3c = x, then the value of x is

Coefficient of x in (x + 9)(8 - 5x) is

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

If tanθ = 815, then 1-sinθ1+sinθ is

A mixture of alcohol and water contains 7% alcohol. How much mixture (in litres) is required to get 357 litres of alcohol?

In an alloy, aluminium and tin are in the ratio of 4 : 5. In the second alloy, the ratio of same elements is 4 : 7. If equal quantities of these two alloys be mixed to form a new alloy, then what will be the ratio of both of these elements in the new alloy?

Instead of multiplying by 25, a student multiplies that number by 52 and gets 324 more than correct answer. Then that number is