###Human: Emily bought a shirt and a coat for $600. What does the shirt cost if it is one-third the price of the coat?, ### Assistant: Let X be the price of the shirt.
The price of the coat is X*3.
The total amount is X + X*3 = $600.
Combining like terms, we get X*4 = $600.
Dividing both sides by 4, we get X = $600 / 4 = $150. 
 So the answer is :  150