Question 12154
"Juan has 4 more cards than Kim."
Let Kim have "X" cards
Then Juan has X+4

 "Larry has 2 more cards than Juan. "
NOw Larry has (X+4)+2 = X+6

"Altogether they have 100 cards."
So X + (X+4) + (X+6) = 100

3X+10 = 100
Subtracting 10 on both sides

3X = 100-10 
3X = 90
X = 30 (Kim has these many)
Juan has 30+4 = 34
Larry has 34 + 2 = 36
Check:
30+34+36 = 100 Yay!!