1970 AHSME Problems/Problem 25
Problem
For every real number 
, let ![$[x]$](http://latex.artofproblemsolving.com/b/c/e/bceb7b14e55d33a8bca29b7863ad3cdae95afce4.png)
be the greatest integer which is less than or equal to . If the postal rate for first class mail is six cents for every ounce or portion thereof, then the cost in cents of first-class postage on a letter weighing 
ounces is always
![$\text{(A) } 6W\quad \text{(B) } 6[W]\quad \text{(C) } 6([W]-1)\quad \text{(D) } 6([W]+1)\quad \text{(E) } -6[-W]$](http://latex.artofproblemsolving.com/d/d/8/dd87b2bfea27ac57c7b6152f364f45de184af6ac.png)
Solution
See also
| 1970 AHSC (Problems • Answer Key • Resources) | ||
| Preceded by Problem 24 |
Followed by Problem 26 | |
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| All AHSME Problems and Solutions | ||
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