Find X :

X * 45 + X * 34 + X * 45 

 jenny has 1 cakes

I don't know this question:There are 5 salmons,2 sharks,2 dolphins and 67 mackerels.How many fish are there?

(A).76 fish                  (B).54 fish                   (C) 72 fish                 (D) 73 fish