Question

There are 200 students in the school choir. Twenty percent of them are in third

grade and of them are in sixth grade. How many choir students are not in
third or sixth grade?

Answer 1

There are 200 students in the school choir. Twenty percent of them are in third grade and of them are in sixth grade.

⇒ choir students are not in third or sixth grade: 100% - 20% = 80%

⇒ choir students are not in third or sixth grade :

200 × 80% = 160 (students)

Answer: 160 students

OK done.Thank to me :>