Examples with solutions for Converting Fractions to Percentages and Vice Versa: Calculate the percentage of the whole number

Exercise #1

What is 70% of 90?

Video Solution

Answer

63

Exercise #2

If there are 18 balls in a box of which 23 \frac{2}{3} are white:

How many white balls are there in the box in total?

Video Solution

Answer

12

Exercise #3

In a box there are 28 balls, 14 \frac{1}{4} of which are orange.

How many orange balls are there in the box in total?

Video Solution

Answer

7

Exercise #4

In Roberto's family, 75% are women and there are 9 men.

Calculate the number of females in Roberto's family.

Video Solution

Answer

27

Exercise #5

The salary Sebastian receives each month is 5000. He spends 75% of the money and saves the rest. How much does Sebastian spend per month?

Video Solution

Answer

3750

Exercise #6

Kevin bought a computer and paid 3500 as a deposit. That sum is 35% of the total cost of the computer. Find the price of the computer.

Video Solution

Answer

10000

Exercise #7

50% of the 48 students in an eighth grade class passed their math test. How many students failed?

Video Solution

Answer

24

Exercise #8

The registration fees for the University of Lima are 424$ : At the open house they gave a discount of 50%. What are the registration fees for the university at the open house?

Video Solution

Answer

212

Exercise #9

The number of female students participating in the 7th grade camp is 240, and their percentage is 30% of all students participating in the camp. Find the number of students (including girls and boys) participating in the summer camp.

Video Solution

Answer

800

Exercise #10

There are 125 chairs in a room. 60% of the chairs are white , while the rest are black. How many black chairs are there?

Video Solution

Answer

50

Exercise #11

50% of the 7th graders received a gift while the remaining 50 did not.

Work out the total number of students who are in the 7th grade.

Video Solution

Answer

100

Exercise #12

The salary Lucy receives each month is 5000. She spends 75% of the money and saves the rest. How much money does Lucy save per month?

Video Solution

Answer

1250

Exercise #13

The number of students in the 7th grade camp is 240. 30% of the students are girls. Calculate the number of boys participating in the summer camp.

Video Solution

Answer

168

Exercise #14

50% of the 48 students in an eighth grade class were successful on their math test. How many students were successful?

Video Solution

Answer

24

Exercise #15

In a certain room, there are 124 different tables. 75% of the tables in the room are from China and the rest from the Netherlands. Find the number of tables from the Netherlands.

Video Solution

Answer

31

Exercise #16

The price of a shirt in a shop is $160. After one month, the shop offered a 30% discount on their shirts. Calculate the price of the shirt after the discount.

Video Solution

Answer

$112

Exercise #17

80% of the students in a class are boys, while the number of students who are girls is 12. How many students are there in total?

Video Solution

Answer

60

Exercise #18

A class comprises 40 students, 70% of whom are boys. How many girls are there in the class?

Video Solution

Answer

12