<|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
Using the numbers [10, 20, 50, 100], find a way to achieve the target 80. Use basic arithmetic operations. Each number must be used only once. Show your work in <think> </think> tags. Return the final equation and its result in the <answer> </answer> tag, for example <answer> (10 * 20) - 50 = 150 </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>