GMAT 考满分题库

- 数学PS -

Machines , , and took a total of 220 minutes to produce all of the parts for a new device. If machine took 2 times as many minutes as machine and 3 times as many minutes as machine , how many more minutes did machine take than machine ?

  • A

    20

  • B

    30

  • C

    40

  • D

    50

  • E

    60

显示答案
正确答案: A

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