Answer:
D)24 people
Step-by-step explanation:
Total number of people, x=300
Number of people donated blood with type A, y

Number of people donated blood with type B, z

⇒Number of people with Type A blood donated more than those with Type B blood= y-z=84-60= 24
5n=30+3n You need to exclude the 4 due to for the first 4GB cost $30 then $3 for each additional GB used
Zero
There is no solution for these equations as there is no even one point of intersection between them