967.61 inches is the correct answer
5 and 12 are factors of 60
-6 and -6 multiply to get 36 but add to get -12.
Hope this helps!
If g=guppy, go=goldfish, b=bettafish and a=angelfish we can set up expressions for each set of fish.
1g=3go
1go=2b
1b=2a
By working backwards and substituting we can finally work out 1 guppy to be equal to 12 angelfish.