A VCR is programmed to record a TV show that lasts for a half hour. If the cassette tape used can accommodate 180 minutes of programming, what percent of the tape is used for this recording?
I did 30/180, reduced to 1/6.
I know the answer is 16 2/3% because I have a key.
How did they turn 1/6 into 16 2/3?
$\frac{1}{6}\times 100\%=16\frac 23\%$