In a survey music preferences
, 81 out of 450 students said that they preferred country music. what percent of the students preferred country music.

We can write all information we have as:

81 answers = x% of 450 students

So we just need to do a simple equation:

81 = x% * 450
81 = * 450
81 =  * 45
81 =                  / * 10 (both sides)
810 = 45x                    / ÷ 45 (both sides)
x = 18 [percent]

18% of the students preferred country music.

d is the answer

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