<|im_start|>system
You are a helpful assistant. You first think about the reasoning process in the mind and then provide the user with the answer. You should try to truely solve the question by yourself without cheating.  <|im_end|>
<|im_start|>user
 Find the mass percentage of O in a mixture containing Calcium hydroxide (Ca(OH)2), Sodium carbonate (Na2CO3), and Potassium sulfate (K2SO4). Show your work in <think> </think> tags. And return the final answer in <answer> </answer> tags.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>
user
100
Find the mass percentage of O in a mixture containing Calcium hydroxide (Ca(OH)2), Sodium carbonate (Na2CO3), and Potassium sulfate (K2SO4).
test