2008 AMC 8 Problems/Problem 7

Problem

If $\frac{3}{5}=\frac{M}{45}=\frac{60}{N}$ , what is $M+N$ ?

$\textbf{(A)}\ 27\qquad \textbf{(B)}\ 29 \qquad \textbf{(C)}\ 45 \qquad \textbf{(D)}\ 105\qquad \textbf{(E)}\ 127$

Separate into two equations 3 over 5 = m over 45 and 3 over 5 = 60 over N and solve for the unknowns. M=27 and N=100 so M+N=E 127 :D

2008 AMC 8 (Problems • Answer Key • Resources)
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