two epuals one?

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We always appreciate small gifts of money .Boss ,of course ,provides a regular supply of bones, but we can also get extra money. Yesterday we got $100 from saling something .$100 can't afford a nice meal.So we decided to buy huoguo-fish.The value is decided by the weight of fish.We had a debate on one big fish or two small fish, the same kg to that big fish. Someone said the meat of two fish is more than one big fish.Others disagree. I was confused.Which is correct?