<human>:  Nicole collected 400 Pokemon cards. Cindy collected twice as many, and Rex collected half of Nicole and Cindy's combined total. If Rex divided his card equally among himself and his three younger siblings, how many cards does Rex have left?
<bot>: How many cards does Cindy have? ** Cindy has 400 x 2 = <<400*2=800>>800 cards.
How many cards do Nicole and Cindy have? ** Nicole and Cindy have 400 + 800 = <<400+800=1200>>1200 cards.
How many cards does Rex have? ** Rex has 1200/2 = <<1200/2=600>>600 cards.
How many cards does Rex have left? ** Rex is left with 600/(3+1=4) = <<600/4=150>>150 cards
#### 150