First find out what the remainder is when 25 is divided by
7. 7 goes into 25 three full times leaving a remainder of 4.
Then take 49, subtract 4 (because you know if it has a remainder of 4 whichever
number is correct will go into 4 less evenly), and you get 45. Next,
go down the list of answer choices, and find the number which fits into
45 evenly. 45 is only evenly divisible by 5, C.