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m = 300 & n = 700. Here's one way to solve:
Take the second equation and multiply both sides by -20: -m - 1.2n = -1140
Now add this equation to the first equation: m + n = 1000 [this will cancel m].
-0.2n = -140. Next multiply both sides by -5: n = 700.
Next substitute this into either of the original equations: m + 700 = 1000 --> m = 300. Check in the other equation to make sure you did it right:
0.05*300 + 0.06*700 = 15 + 42 = 57, so it checks out.
What else can I help you with?
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