Because the total number of people is constant, we must first make the proportion of the total number of people consistent.
3+5=8.3+7= 10 The least common multiple is 40.
So the previous headcount ratio multiplied by 5 becomes 15:25, and then the headcount ratio multiplied by 4 becomes 12:28.
It can be seen that 150 people moved, accounting for 3% of the total. So each serving is 50 people.
Number of people before:
A 15x50=750 people. B 25x50= 1250 people.
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