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Difference between revisions of "2013 CEMC Gauss (Grade 8) Problems/Problem 2"

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{{CEMC box|year=2013|competition=Gauss (Grade 8)|num-b=1|num-a=3}}

Latest revision as of 20:46, 18 October 2025

Problem

The value of $15 - 3 - 15$ is

$\textbf{(A)}\ -18 \qquad\textbf{(B)}\ -15 \qquad\textbf{(C)}\ 3 \qquad\textbf{(D)}\ -3 \qquad\textbf{(E)}\ -33$

Solution 1

$15 - 3 - 15 = 12 - 15 = \boxed {\textbf {(D) } -3}$

~anabel.disher

Solution 2

Let $x = 15$. We then have:

$x - 3 - x = x - x - 3 = \boxed {\textbf {(D) } -3}$

~anabel.disher

2013 CEMC Gauss (Grade 8) (ProblemsAnswer KeyResources)
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Problem 1
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Problem 3
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CEMC Gauss (Grade 8)