how do you time 9 m… - QuestionCove

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Mathematics 9 Online

OpenStudy (anonymous):

how do you time 9 minutes exactly with a 4 minute sand timer and a 7 minute sand timer?

11 years ago

OpenStudy (tkhunny):

Keep in mind that you can work with 4, 7, AND 7-4. Start with flipping them both over at the same time. Then what?

11 years ago

OpenStudy (rational):

you want to solve below equation in integers \[\large 4x+7y = 9\] you will get infinitely many solutions as gcd(4,7) = 1 divides 9

11 years ago

OpenStudy (dan815):

|dw:1428064600888:dw|

11 years ago

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