100 students attended a school carnival. if 60% of the students were less than 10
years old and 75% of the students were over 6 years old, how many children were
between 6 and 10 years old?

100 students attended a carnival.

less than 10 years old: 60% of the students = 60% * 100 = 60/100 * 100 = 60 students
over 6 years old: 75% of the students = 75% * 100 = 75/100 * 100 = 75 students

If you would like to know how many children were between 6 and 10 years old, you can calculate this using the following steps:

If there are 75 children over 6 years old, that means that there must be 25 children (100 - 75) less than 6 years old, so if there are 60 children less than 10 years old, that means that there are 60 - 25 = 35 children over 6 years old.

The correct result would be 35 children.

It comes out of vehicles which pollutes the air