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OpenStudy (anonymous):
how do you time 9 minutes exactly with a 4 minute sand timer and a 7 minute sand timer?
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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?
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
OpenStudy (dan815):
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