Dan and Makiko started doing their homework at the same time. It took Dan twice as long to finish his homework than Makiko did. If Dan also took 40

minutes longer than Makiko did, which of the following systems of equations could be used to determine d

, the amount of time Dan took to finish his homework in minutes, and m

, the amount of time it took Makiko to finish her homework in minutes?
Choose 1 answer:
Choose 1 answer:
(Choice A)

A

(Choice B)

B

(Choice C)

C

(Choice D)

D

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1 answer

(Choice C)

d = 2m
d = m + 40