Blood type \(\mathrm{O}^{-}\)is the universal donor. Anyone needing a blood transfusion can receive this blood type. How many people who donated blood during this drive had \(\mathrm{O}^{-}\)blood?

A blood drive at City Honors High School recently collected blood from 140 students, staff, and faculty. Use the results depicted in the Venn diagram below to answer the following exercise.

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Donors = 140 A 8 2 3 50 4 11 B 52 Rh+ 10