there are six times as many goldfish as guppies in a tank with twenty one fish total, how many goldfish are there

there are six tmes as many goldfish as guppies in a tank with twenty one fish total, how many goldfish are there?
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If X is the number of guppies then 6X is the number of goldfish. The total fish in the tank is 6X+X=7X=21 so X=3 and the number of goldfish is 18.

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