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7 March, 16:36

The admission fee for a charity event is $7 for children and $10 for adults. The event was attended by 700 people, and the total amount collected in admissions was $6,400. There were (blank) children and (blank) adults at the show.

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  1. 7 March, 17:27
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    7x+10y=6400

    x+y=700

    x=700-y

    7 (700-y) + 10y=6400

    4900-7y+10y=6400

    -7y+10y=1500

    3y=1500

    y=500

    x=700-y

    x=700-500

    x=200

    there were 200 children and 500 adults at the show
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