In 2004, the ratio of the number of guppies to the number of goldfish in a pond was 5 : 9. In 2005, 115 guppies and goldfish were placed in the pond. The new ratio of the number of guppies to the number of goldfish was 5 : 4. If there were 165 guppies in the pond in 2005, then how many goldfish were added?
A10
B15
C20
D18
in the question it is written that there are 115 guppies AND goldfish added, but in the solution it is written that there are only 115 guppies added not goldfish. i want answers about this, and QUICK