Mathematics, 18.03.2021 03:00, VamLS7472

In a class, there are twice more boys than girls. Six boys leave the class and six girls arrive ; therefore, there are twice more girls than boys .
How many boys and girls were there at first ?
please show calculations steps plus this should be solved as a system

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In a class, there are twice more boys than girls. Six boys leave the class and six girls arrive ;...