Examples with solutions for Quantity, percentage, percentage value: Change in two elements

Exercise #1

A pool was filled with water over the course of two days:

If on the first day, the pool was filled with 180 m3 m^3 of water constituting 40%.

What is the total amount of water used to fill the pool?

Video Solution

Answer

450 m³

Exercise #2

7000 $ was shared between three people.

The first person received 40% of the total, the second person received 15% of the total and the third person received the remainder.

How much money did they each receive?

Video Solution

Answer

The first person received 2800 dollars: the second person received 1050 dollars and the third person received 3150 dollars.

Exercise #3

Six 9th grade students attend acting classes. They make up 24 percent of the class as a whole.

A further 16% of the 9th grade students attend dance class.

The rest of the students do not participate in any extracurricular classes.

How many students attend the dance class?

Video Solution

Answer

4 students

Exercise #4

A group of students and teachers go on a school trip, of which 180 are students.
25% of the group are from the eighth grade, 20% are from the ninth grade, 40% are from the seventh grade, and the rest of the group are teachers.

How many students from the seventh and eighth grades go on the trip?

Video Solution

Answer

117 students