16. Meili baked some pies. She gave 1/5 of them to her sister and 30 of them to her friends. She was left with 2/3 of the pies. She packed these into 15
boxes. Some boxes contained 9 pies while the rest contained 12.

(a) How many pies were packed into the 15 boxes?

(b) How many boxes contained 9 pies?