MathDB
2010 AMC 8 #7

Source:

May 21, 2011

Problem Statement

Using only pennies, nickels, dimes, and quarters, what is the smallest number of coins Freddie would need so he could pay any amount of money less than one dollar?
<spanclass=latexbold>(A)</span> 6<spanclass=latexbold>(B)</span> 10<spanclass=latexbold>(C)</span> 15<spanclass=latexbold>(D)</span> 25<spanclass=latexbold>(E)</span> 99 <span class='latex-bold'>(A)</span>\ 6 \qquad<span class='latex-bold'>(B)</span>\ 10\qquad<span class='latex-bold'>(C)</span>\ 15\qquad<span class='latex-bold'>(D)</span>\ 25\qquad<span class='latex-bold'>(E)</span>\ 99