<|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 [15, 25, 30, 45], find a combination that reaches the target of 100 using basic arithmetic operations (+, -, *, /). You can use each number only once. Show your work in <think> </think> tags. Return your final equation and solution in <answer> </answer> tags, for example <answer> [expression] = 100 </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>