Jax gets 4 packs per month...each pack contains 4 cards...so he gets 16 cards per month. Sofia gets 3 packs per month..each pack contains 4 cards...so she gets 12 cards per month..
56 + 16m = 68 + 12m 16m - 12m = 68 - 56 4m = 12 m = 12/4 m = 3.....they will have the same number of cards in 3 months