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2 December, 20:21

During a blood drive, the ratio of Type O donors to non - Type O donors was 37:43. About how many Type O donors would you expect in a group of 290 donors?

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  1. 2 December, 20:34
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    134

    Step-by-step explanation:

    The ratio of Type O donors to total donors was ...

    ... 37 : (37+43) = 37 : 80

    So, 37/80 is the fraction of total donors that were Type O.

    Then the number of Type O donors expected in a group of 290 is ...

    ... (37/80) · 290 = 134.125 ≈ 134
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