A3. In a class, $55 \%$ of students scored at least $55 \%$ on a test. $65 \%$ of students scored at most $65 \%$ on the same test. What percentage of students scored between $55 \%$ and $65 \%$ (inclusive) on the test?
SolUtion
$20 \%$

As $55 \%$ of students scored at least $55 \%$ on the test, $45 \%$ of the students scored less than $55 \%$. Also, $65 \%$ of students scored $65 \%$ or less on the test, so the percentage of students who scored between $55 \%$ and $65 \%$ (inclusive) is $65 \%-45 \%=20 \%$.