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?
Cindy has 400 x 2 = 
<gadget id="calculator">400*2</gadget>
<output>800</output>
800 cards.
Nicole and Cindy have 400 + 800 = 
<gadget id="calculator">400+800</gadget>
<output>1_200</output>
1200 cards.
Rex has 1200/2 = 
<gadget id="calculator">1200/2</gadget>
<output>600</output>
600 cards.
Rex is left with 600/(3+1=4) = 
<gadget id="calculator">600/4</gadget>
<output>150</output>
150 cards.

<result>150</result>