GMAT Quantitative Reasoning Practice Test 2

Question : 31 of 100

Marks: +1, -0

QUESTION 131 What is the sum of all the even numbers bigger than

(-10)

and smaller than 12 ?

Solution:

This is a series of numbers with a constant spacing between them.
The first number is

(-8)

and the last is

(10)

, there are 10 numbers altogether.
The formula for such a series is:

((-8+10) × 10) \/ 2=10

.
The second way to answer such a question is to write the numbers and add them.

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