Quantitative Aptitude - Arithmetic Ability Questions

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

(secA - 1)/(secA + 1) is equal to?

D and E are the points on the sides AB and AC respectively of a ΔABC and AD = 8 cm, DB = 12 cm, AE= 6 cm and EC = 9 cm, then BC is equal to:

Which of the numbers given below is NOT rational?

The  sum  of  three  prime  numbers  is  100.  If  one  of  them  exceeds  another  by  36,  then  one  of  the numbers is

The product of two numbers is 0.432. One of the numbers is 1.6. What is the other number?

If x2 + ax + b, when divided by x + 3, leaves a remainder of -1 and x2 + bx + a, when divided by x - 3, leaves a remainder of 39, then a+ b = ?

If 1+y16-74, then the value of 5y-15