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Question

Answer

If there were 5u children at first, there were 4/5 * 5u = 4u adults at first.

After 60 children left and 60 adults entered, there were (5u – 60) children and (4u + 60) adults.

Given 

2 * ( 5u – 60 ) = 4u + 60

10u -120 = 4u + 60

6u = 180

u = 30

4u = 120

There were 120 adults at first.

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