Find a Percent of a Number, Study notes of Mathematics

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Find a Percent

1. Out of 25 students in a class, 15 students take dance lessons. What percent of the students in the class take dance lessons?
2. A television that normally costs $480 was on sale for $336. What percent was the price reduced?
3. At Knox Middle School, 120 students play soccer. Of those students 48 are girls. What percent of girls play soccer at Knox Middle School?
4. Of 25 students who play violins, 8 have soft-sided instrument cases. What percent of the violinists have soft-sided cases?
5. Among 40 finalists in a music competition, 6 play trumpets, 4 play violins, and 1 plays tuba. The rest are singers. What percent of the finalists are singers?

Find a Number When a Percent

is Known

1. Of Jerry’s teachers, 45% are female. If Jerry has 9 female teachers, how many teachers does he have altogether?
2. On a math quiz, Sandra got 12 of the problems correct. Her score was 80%. How many questions were on Sandra’s math quiz?
3. Mark has answered 8 questions on a survey, which is 25% of the questions. How many questions are on the survey?
4. In June, the sale of fish totaled 18% of Petsmart’s sales, which came to $7,560. What were the total sales in June?
5. On Friday, 12 of the Sun City fire trucks were used, which is 75% of the trucks. How many fire trucks does Sun City have?