Quantitative Aptitude - Arithmetic Ability Questions

If secA -­ tanA = x, then the value of x is

Two students appeared for an examination. One of them secured 13 marks more than the other and his marks were 76% of the sum of their marks. The marks obtained by them are

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

Choose the one which is odd from the following options.

If  C+1C = 3, then what is the value of C3+1C3 = ?

If cos 21° = x/y, then cosec 21° -­ cos 69° is equal to

A train crosses a 550 m long platform in 36 seconds. How long was the train if it was travelling at the speed of 70 kmph?

A man is 3 years older than his wife and four times as old as his son. If the son becomes 15 years old after 3 years. Then what is the present age of the wife?