2018 AMC 12A Problems/Problem 1

Revision as of 13:28, 8 February 2018 by Speck (talk | contribs) (Created page with "==Problem== A large urn contains <math>100</math> balls, of which <math>36 \%</math> are red and the rest are blue. How many of the blue balls must be removed so that the per...")
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Problem

A large urn contains $100$ balls, of which $36 \%$ are red and the rest are blue. How many of the blue balls must be removed so that the percentage of red balls in the urn will be $72 \%$? (No red balls are to be removed.)

$\textbf{(A)}\ 28 \qquad\textbf{(B)}\  32 \qquad\textbf{(C)}\  36 \qquad\textbf{(D)}\   50 \qquad\textbf{(E)}\ 64$

Invalid username
Login to AoPS