Tuesday, August 08, 2006

Plugging in Numbers

When dealing with math problems that include variables in both the question and answer choices, it is easier to plug in numbers and test out which answer choice meets the correct criteria.

Sample Problem:

If a is an odd integer and b is an even integer, which of the following is an odd integer?

(A) 3b
(B) a + 3
(C) 2(a + b)
(D) a + 2b
(E) 2a + b

The easiest way to solve this problem is to create numbers for a and b. So, lets choose some:

a = 3
b = 4

Now, test out each answer choice with your numbers.

(A) 3(4) = 12
(B) 3 + 3 = 6
(C) 2(3 + 4) = 2(7) = 14
(D) 3 + 2(4) = 3 + 8 = 11
(E) 2(3) + 4 = 6 + 4 = 10

Just by plugging in one set of simple numbers, it is clear that (D) is the correct answer, because it is the only choice that is odd with the number 11.



1 Comments:

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