In a group of 100 blood donors, typically 9/25 have type A+ blood and 3/50 have type A- blood. What fraction has type A blood all together?
9/25 = 18/50
18/50 + 3/50 = ?
21/50?
This is what I was wondering was if I was supposed to add the 2 together! Thank you!
Yes, 21/50
You're welcome.
To find the fraction of blood donors with type A blood, we need to add the fractions of donors with type A+ and type A- blood together.
First, we'll find the fraction of donors with type A+ blood. We're told that typically 9/25 donors have type A+ blood out of a group of 100, so we can calculate this fraction by dividing 9/25 by 100:
(9/25) / 100 = 9/2500
Next, we'll find the fraction of donors with type A- blood. We're told that typically 3/50 donors have type A- blood out of a group of 100, so we can calculate this fraction by dividing 3/50 by 100:
(3/50) / 100 = 3/5000
Finally, we'll add the two fractions together to find the fraction of donors with type A blood:
9/2500 + 3/5000 = 18/5000
Therefore, the fraction of blood donors in the group with type A blood, either A+ or A-, is 18/5000.