# Math

20+20+20=60. How can you make 60 again by using the same number 3 times, but it can’t be 20?

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# Math

One out of 9 otherwise identical balls is overweight. How can it be identified after 2 weighings?

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20+20+20=60. How can you make 60 again by using the same number 3 times, but it can’t be 20?

One out of 9 otherwise identical balls is overweight. How can it be identified after 2 weighings?