Answer:
1,500 Well you didn't really give a question or much information but depending on what your trying to answer I can help
Explanation:
so first if you are trying to answer how much grams in all, you would times 50 by 30 which equals 1,500, or if you are trying to see how much food each fish gets, you would take 50 times 30, which equals 1,500 and then divide that by the amount of fish which would give the answer to that. hope I helped