Question
Avery and Gavin shared 510 marbles. After Avery gave Gavin 30 marbles, Avery had 5 times as many marbles as Gavin. How many marbles did Gavin have at first?
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Avery and Gavin shared 510 marbles. After Avery gave Gavin 30 marbles, Avery had 5 times as many marbles as Gavin. How many marbles did Gavin have at first?