<|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
 Drew gave 1/4 of his marbles to Marcus. After this, each boy then had 35 marbles. How many more marbles did Drew have than Marcus at first? 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
140
Drew gave 1/4 of his marbles to Marcus. After this, each boy then had 35 marbles. How many more marbles did Drew have than Marcus at first?
test