Difference between revisions of "1994 AJHSME Problems/Problem 25"
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Revision as of 23:14, 4 July 2013
Problem
Find the sum of the digits in the answer to
where a string of 
nines is multiplied by a string of fours.
Solution
Notice that:
and 
and 
So the sum of the digits of x 9s times x 4s is simply 
.
Therefore the answer is 
See Also
| 1994 AJHSME (Problems • Answer Key • Resources) | ||
| Preceded by Problem 24 |
Followed by Last Problem | |
| 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 | ||
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions. 
