There were 30 students in the gym. 70% of the students in the gym were playing basketball. How many students in the gym were playing basketball?

21

Step-by-step explanation:

you multiply 30 by 0.7 and you get 21.

21

Step-by-step explanation: 30=100%

                                               3=10%

                                            0.3=1%

                                             3*7=21

                                             21=70%

12.4%

Step-by-step explanation:

The results from the random sample counts 124 from a total of 1000 people that wear contact lenses. This means is the percentageof the people in the sample that wear contact lenses.Because it is a random sample, it is suppose to reflect the behavior of the total population. Then we can expect or predict  similar percentage of Americans wearing contact lenses (12.4%).