Question
If Zane gives each of his friends 7 correction tapes, he will have 21 left. If he gives each of them 9 correction tapes, he will have 9 correction tapes left. How many friends does Zane give correction tapes to?
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If Zane gives each of his friends 7 correction tapes, he will have 21 left. If he gives each of them 9 correction tapes, he will have 9 correction tapes left. How many friends does Zane give correction tapes to?