Choose the pair of words that does not belong with the others.

D. FISH - CORAL

If the roots of the quadratic equation x² - 5x + k = 0 are real and equal, what is the value of k?

A. 6.25
Posted in:  Quadratic Equations -  Algebra -  Mathematics

A is married to B. They have two children, C and D. C is a doctor, and D is a lawyer. If B is a teacher, what is A's profession if it is known that one parent is not in a profession related to education or law?

C. ENGINEER

In a family of five members A, B, C, D, and E, A is the father of B. C is the mother of B and D is the sister of B. E is the grandfather of B. How is D related to E?

A. GRANDDAUGHTER

If A can do a piece of work in 15 days and B can do the same work in 10 days, how much time will they take to complete the work together?

B. 7.5 DAYS
Posted in:  Time & Work -  Aptitude -  Mathematics