in a group of 100 blood donors, typically 9/25 have type a rh-positive and 3/50 have type a rh-negat

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in a group of 100 blood donors, typically 9/25 have type A Rh-positive blood and 3/50 have type  A Rh-negative blood. What fraction have type A blood?

Apr 24th, 2015

100 donors

A Rh-positive = 9 / 25  *  100

                       = 9 * 4

                       = 36

A Rh-negative = 3 / 50  *  100

                        = 3 * 2

                        = 6

Now  

A type blood = 36 + 6

                     = 42

A type from 100 donors = 42 / 100

                                       = 21 / 50  A type

Apr 24th, 2015

thank you!!

Apr 24th, 2015

My pleasure!!! Plz best, Thanks






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Apr 24th, 2015

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