Do not do any paper or calculator calculations for any part of this question

A.) What is a if a/15 = 1/2?

Justify your answer with a picture.

B.) For each pair of fractions, determine which is closer to 1/2. Briefly explain your reasoning. i.) 11/25 or 13/25 ii.)5/8 or 9/20 iii.)12/25 or 7/15 iv.) 11/24 or 9/20