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22-06-2020
Mathematics

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The mean of four numbers is 7. Three of the numbers are 2, 5, and 17. What is the fourth number?
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29-06-2020

Answer:

If the mean of four numbers is 7, we know that their sum is 7 * 4 = 28. We can use this information to find the last number. If the fourth number is x, we can write:

2 + 5 + 17 + x = 28

24 + x = 28

x = 4

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