Quantitative Aptitude - Arithmetic Ability Questions

Which one among the following does not belong to the group?

A discount series of 15%, 20% and 25% is equal to the single discount of?

The sum of two positive integers is 80 & difference between them is 20. Then what is difference of squares of those numbers ?

If SinX-CosX=1, where 'X' is an acute angle, the value of SinX+CosX is

Two numbers are 30% and 37% lesser than a third number. By how much percent is the second number to be enhanced to make it equal to the first number?

A book is sold at three successive discounts of 20%, 20% and 10%. What is the net discount (in percentage)?

A man can row upstream at 12 km/hr and downstream at 18 km/hr. The man's rowing speed in still water is

If (4x - 3) = (3x + 8), then the numerical value of(x + 1)3  is