Xiaoming and Xiaojun have 52 cards in total, and the number of Xiaoming's cards is two times that of Xiaojun's. how many cards do they each have?
(52-4)÷3=16
16×2+4=36
If Xiaojun has X cards, Xiaoming has 2x + 4 cards
2x+4+x=52
3x=48
x=16
2x+4=36
A: Xiaojun has 16 cards and Xiaoming has 36