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【OG20-P146-5题】
A certain restaurant that regularly advertises through the mail has 1,040 cover letters and 3,000 coupons in stock .In its next mailing ,each envelope will contain 1 cover letters and 2 coupons .If all of the cover letters in stock are used ,how many coupons will remain in stock after this mailing?
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暂无雷哥网文字解析
使用letters与coupons比例是1:2
3000-1040*2=920
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