Question

When 5 is added to a set of 3 numbers the mean increases to 4.6. What was the mean of the original 3 numbers?

Answer 1

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➷  Multiply 4.6 by 4 to get the sum of the numbers after 5 was added:

4.6 x 4 = 18.4

^ This is the new total

Subtract 5 from this:

18.4 - 5 = 13.4

Divide this value by 3 to get the original mean:

13.4/3 = 67/15

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