Solving application problems by proportion in sixth grade

There are X people in Class B and 5/7x people in Class A..

When three people are transferred from Class B to Class A, Class B now has x-3 people and Class A now has (X-3) 4/5. At this time, Class A has three more people than before, from which an equation about the number of class A can be listed.

(x-3) 4/5 = 5/7x+3 and x=63, so there are 5/7 63 = 45 people in Class A.

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