1. A bag can hold 12 markers or 15 pens.If there are already 4 markers and 5 pens,how many more markers can be put into the bag?
2. There were some rows of chairs in a room.Each row had 5 chairs.When Keith brought in 2 extra chairs and rearranged all the chairs ,there were 4 chairs in each row and 3 more rows than before. How many chairs were there at first?
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