<|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 [20, 10, 5, 4], find and show a valid equation that equals 160. Remember to use each number exactly once and only use basic arithmetic operations. Your answer should show the equation and its solution, enclosed in <answer> </answer> tags like this: <answer> 20 * 10 - 5 = 160 </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>