Individual 20463

There are 59 pupils in the 9th grade. In 9A, there are 15% more pupils than in 9B. In 9C, there are 20% fewer than in 9B. How many pupils are in individual classes?

Correct answer:

a =  23
b =  20
c =  16

Step-by-step explanation:


a+b+c=59
a = 1.15b
c = b-0.20b

a+b+c=59
a = 1.15•b
c = b-0.20•b

a+b+c = 59
a-1.15b = 0
0.8b-c = 0

a = 23
b = 20
c = 16

Our linear equations calculator calculates it.



Did you find an error or inaccuracy? Feel free to write us. Thank you!







Tips for related online calculators
Need help calculating sum, simplifying, or multiplying fractions? Try our fraction calculator.
Our percentage calculator will help you quickly calculate various typical tasks with percentages.
Do you have a system of equations and looking for calculator system of linear equations?

You need to know the following knowledge to solve this word math problem:

Related math problems and questions: