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Mark and Don are planning to sell each of their marble collections at a garage sale. If Don has 1 more than 4 times the number of marbles Mark has, how many does each boy have to sell if the total number of marbles is 91 ?

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dbruno166

Answer:

Mark has 18 and Don has 73

Step-by-step explanation:

Let M = Mark and let D = Don

D = 4M + 1

D + M = 91

Substitute and solve for M

4M +1 + M = 91

5M = 90

M = 18

Therefore D = 4(18) + 1 = 73

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