The Answer Would Be 3/7
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8n-(2n-3)=12
8n-2n+3=12
6n=12-3
6n=9
n=9/6=3/2
The answer is
D. The number of students who ate 10 hamburgers or more
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Three main methods come to mind: Substitution method, Elimination method, Matrix row-reduction.The first two methods are taught in early grades in most high schools. Matrix row-reduction is taught in senior years in high school, or more likely, in the early years of a university math or science program.
