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Back to Gauss’s Method

Exercise 22

Avg difficulty 3.0

Four positive integers are given. Select any three of the integers, find their arithmetic average, and add this result to the fourth integer. Thus the numbers 29, 23, 21, and 17 are obtained. One of the original integers is:

  • (a)  19     (b)  21     (c)  23     (d)  29     (e)  17

Hefferon, Linear Algebra, Linear Systems, Gauss’s Method, Exercise 22

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Adapted from Linear Algebra © 2016 Jim Hefferon. Licensed under CC BY-SA 3.0 US. Source: Linear Algebra. Imported at revision df2262e.