Question

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?

Answer 1

134

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