Can you help me with this two question? just multiple choice but need a reason why we choose those answer

In a system with fixed partitions, there are 4 partitions available to jobs. Their sizes are 16,32,48, and 64 KB. Four jobs executed by the system at the moment have the following sizes: 12,22,42, and 55 KB. The amount of internal fragmentation expressed in KB is: a. 0 b. 12 c. 17 d. 25 e. 29 f. 34 g. 41 h. 56 Question 6: In a certain paging system, there are four levels of tables, and the effective address size is 50 bits. The page size is 16KB and each of the four indexes uses the same number of bits extracted from the address. That number is: a. 7 b. 8 c. 9 d. 10 e. 11 f. 12 g. 13 h. 14