There are 70 students in the school band. 40% of them are sixth graders, 20% are seventh graders, and the rest are eighth graders. How much is there of each grade?
If there is a total of 70, it means that 100% is 70. We know the percent of students that are in six grade and the percent that are in seventh grade. So we simply just have to add the 40% and 20% to get the 60% we already know. So then you’d subtract the 60% from the 100% to get the final 40% of students.
