A researcher, studying dolphins in the wild, made the following sketch. Each dot on the map represents one dolphin. The area surveyed by the scientist was 1 km2. Based on the researcher’s data, how many dolphins would you estimate to be in a 3 km2 area?

21

Explanation:

since 7 re in 1km2

then 21 would be in 3km2

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true is the final answer!