There are two dogs. Both have fleas.
If one flea jumps from the 1st dog to the 2nd, then both will have the same amount.
Or if one flea jumps from the 2nd dog to the 1st, then the 1st will have 5 times the amount of the 2nd.
How many fleas do each dog have before any jumping takes place?
Answer
1st dog has 4 fleas
2nd dog has 2 fleas
