Mathematics, 23.06.2019 03:00 janeou17xn

Jane writes numbers on 4 cards. the number has rubbed off the last card, but she knows that the mean of the numbers is 15 13 22 11 what number was on the 4th card?

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Jane writes numbers on 4 cards. the number has rubbed off the last card, but she knows that the mean...

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