Difference between revisions of "1991 AJHSME Problems/Problem 19"
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Latest revision as of 12:16, 8 October 2015
Problem
The average (arithmetic mean) of different positive whole numbers is
. The largest possible value of any of these numbers is
Solution
If the average of the numbers is , then their sum is
.
To maximize the largest number of the ten, we minimize the other nine. Since they must be distinct, positive whole numbers, we let them be . Their sum is
.
The sum of nine of the numbers is , and the sum of all ten is
so the last number must be
.
See Also
1991 AJHSME (Problems • Answer Key • Resources) | ||
Preceded by Problem 18 |
Followed by Problem 20 | |
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | ||
All AJHSME/AMC 8 Problems and Solutions |
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