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6. A school ordered $600 worth of light bulbs. Some of the light bulbs cost $1 eachand the others cost $2 each.
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This semester, my class has a new English teacher. She is a young and beautiful lady. We have a great impression on her. However, after several classes later, things have changed. Firstly, she always talks in English. We don¡¯t understand her words. We tell her that, but nothing changes. Besides, she always asks us in English. The result is that we can¡¯t answer her question, because we can¡¯t understand her. In addition, she is serious and never smiles to us. We feel so depressive to have her lesson. Therefore, all students are afraid of having English lesson.
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If a, b, c, and d are positive integers, what is the smallest possible value of d?
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