<|im_start|>system
You are a helpful assistant. You first thinks about the reasoning process in the mind and then provides the user with the answer.<|im_end|>
<|im_start|>user
In this challenge, your goal is to create an equation that equals 100 using the numbers [25, 50, 75, 80]. You can use the basic arithmetic operations (+, -, *, /). Each number should only be used once. To show your work, solve the equation step by step, if possible, and write the formatted equation you came up with. For example, if your final answer is correct, you would write it in the form of <answer> </answer>. Ensure to include the thought process behind your answer in <think> </think> tags. Here are the options to choose from: [25, 50, 75, 80]. Solve and provide the final equation.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>