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[size=9.000000pt]A combined total of 55 lightbulbs are stored in two boxes; of these, a total of 7 are broken. If there are exactly 2 brokenbulbs in the first box, what is the number of bulbs in the second box that are not broken?
[size=9.000000pt](1) In the first box, the number of bulbs that are not broken is 15 times the number of broken bulbs.
(2)The total number of bulbs in the first box is 9 more than the total number of bulbs in the second box.
答案是(1)和(2)都可以,请问分别怎么推导出来的呢?
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