In sean's fish tank, there are 6 times as many goldfish as guppies. there are a total of 21 fish in the tank. how many more golden fish are there than guppies?

The number of gold fishes which are more than guppies are:

                          15

Let the number of guppies in the fish tank =x

and it is given that:

There are 6 times as many goldfish as guppies.

This means that the number of goldfishes in the tank are: 6x

Also, it is given that:

There are a total of 21 fish in the tank.

i.e.

Hence,

This means that:

There are 15 (18-3=15) more goldfishes in the tank then guppies.

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can i know which language is this?