<|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
Given the numbers [10, 11, 15, 25], create an equation that equals 50 using only basic arithmetic operations (+, -, *, /), with each number only to be used once. Show your work in <think> </think> tags. Return the final equation and answer in <answer> </answer> tags, like so: <answer> (10 * 5) + (11 - 1) = 50 </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>