<|im_start|>system
You are a helpful assistant. You first think about the reasoning process in the mind and then provide the user with the answer. You should try to truely solve the question by yourself without cheating.  <|im_end|>
<|im_start|>user
 A newspaper conducted a survey on "What is the spirit of Lei Feng in the new era?" The number of questionnaires collected from units A, B, C, and D formed an arithmetic sequence, and a total of 1,000 questionnaires were collected. For reporting purposes, a sample of 150 was drawn from the collected questionnaires by stratified sampling according to the unit. If 30 questionnaires were drawn from unit B, then how many questionnaires were drawn from unit D? Express your answer as a whole number. Show your work in <think> </think> tags. And return the final answer in <answer> </answer> tags.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>
user
60
A newspaper conducted a survey on "What is the spirit of Lei Feng in the new era?" The number of questionnaires collected from units A, B, C, and D formed an arithmetic sequence, and a total of 1,000 questionnaires were collected. For reporting purposes, a sample of 150 was drawn from the collected questionnaires by stratified sampling according to the unit. If 30 questionnaires were drawn from unit B, then how many questionnaires were drawn from unit D? Express your answer as a whole number.
test