The number of fish in a lake decreased by 25% between last year and this year. last year there were 60 fish in the lake. what is the population this year?

45

Step-by-step explanation:

Decreasing by 25% means that there is 25% less of last years amount or 0.25x less. It also means that this year there is only 75% of what was last year actually in the lake or 0.75x. Since last year, there were 60 fish, this means this year there is 0.75(60) = 45. This year has 45 fish.

Credit to this answer goes to @MrsStrong

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