Read the following directions carefully and answer the questions and mark as follows:
What is value of a?
- Ratio of $a$ & $b$ is $3 : 5$ where $b$ is positive.
- Ratio of $2a$ and $b$ is $12/10$ where $a$ is positive.
- If any one of the statements alone is sufficient to answer the question.
- If both statements individually are sufficient to answer the question.
- If both statements together are required to answer the question.
- If both statements are not sufficient to answer the question.