A trout population grew from 4 in 1992 to 16 in 1993 and then to 64 in 1994. If it continued to grow exponentially, approximately how many trout were there in 1995?

The population quadrupled each year: 16 ÷ 4 = 4, and 64 ÷ 16 = 4. Continuing that exponential growth, 64 × 4 = 256 trout in 1995, so the answer is 256.

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