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Verified Answer :

p for guppies
g for goldfish

g+p=21
g=6p
substitute
(6p)+p=21
7p=21
p=3

3 guppies...
3 x 6 = 18
6 goldfish...
18-3=15

15 more goldfish!

Answer:

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

                          15

Step-by-step explanation:

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.

\(x+6x=21\\\\i.e.\\\\7x=21\\\\x=\dfrac{21}{7}\\\\x=3\)

Hence,

  • The number of goldfish in the tank = 6×3 = 18 goldfishes.
  • and number of guppies in the tank = 3

This means that:

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

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