The task is to generate the correct answer for a given math problem.

Problem: which number can we add to 425897 to get a number exactly divisible by 456 ?
7

Problem: 30 pens and 75 pencils were purchased for 750 . if the average price of a pencil was 2.00 , find the average price of a pen .
20

Problem: whats the reminder when 58 , 458,965 , 231,457 , 895,684 , 525,465 , 985,445 is divided by 16

5