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Answer:
M = 21
D = 87
Explanation:
D = Don
M = Mark
D = 3+ 4M
M +D = 108
M +(3 + 4M) = 108
3+4M = 108
105 = 5M
Then we substitute:
D = 3 + 4M
D = 3 + 4(21)
D = 3 + 84
Don has 87, and Mark has 21.
Thanks!
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