Discussion
Read the following table :
| Blood Group | Number of Students |
|---|---|
| A | 9 |
| B | 6 |
| O | 12 |
| AB | 3 |
| Total | 30 |
What is the ratio of the most common and rarest blood groups ?
Answer: C
The ratio is 4 : 1.
From the table, the most common blood group is O with 12 students, and the rarest is AB with 3 students. The ratio of the most common to the rarest is:
\[ 12 : 3 = 4 : 1 \]
The order matters: the question asks for most common to rarest, so 1 : 4 reverses it. 3 : 1 compares A (9) with AB (3), and 1 : 3 is that ratio reversed.
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