In a certain fishery that contains only speckled and rainbow trout, the number of male speckled trout is 45 more than twice the number of female speckled trout. 645 total speckled trout live in the fishery. If the ratio of female speckled trout to male rainbow trout is 4:3 and there are 1000 total trout in the fishery, how many female rainbow trout are there?
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正确答案: D