5, 20, 24, 6, 2, 8, ?
5 × 4 = 20 20 + 4 = 24 24 ÷ 4 = 6 6 - 4 = 2 2 × 4 = 8 8 + 4 = 12 12 ÷ 4 = 3 3 - 4 = -1 -1 × 4 = -4 ...
blackjack
flooble's webmaster puzzle