Ken and Ron had some stickers. Ken have Ron 1/4 of his stickers. As a result, Ken had 51 stickers and Ron had 62 stickers in the end. How many stickers did Ron have at first?

Call the number of stickers that Ken had at first, K

Note that they have 113 stickers total

K - (1/4)K = 51

(3/4)K = 51

K = 51 * 4/3 = 68 = what Ken had at first

113 - 68 = 45 = what Ron had at first