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16 May, 15:35

A scientist wants to estimate the number of roads living near a lake.

On Friday she catches 90 toads and tags them. She releases the toads.

On Saturday she catches 50 roads and 7 of them are tagged.

Estimate the number of toads that live near the lake.

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  1. 16 May, 15:39
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    90 + 50 = 140

    140 - 7 = 133

    130 - 140
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