I presume you mean 25 mm (25 millimeters) wide, not 25 mega-meters (25,000 km, which is about twice the diameter of the Earth), and that this is not a trick question about a shelf 1 m wide meaning deep, so the answer depends on what the length of the shelf is. A meter (I'll use my nation's spelling, you use yours!) is 1,000 mm, so we divide 1,000 by 25. The answer is 40.
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To determine how many books 25mm wide can fit on a shelf 1 meter wide, we first need to convert the width of the shelf to millimeters. Since 1 meter is equal to 1000mm, a shelf 1 meter wide is 1000mm wide. Next, we divide the width of the shelf by the width of each book to find out how many books can fit. In this case, 1000mm divided by 25mm equals 40 books. Therefore, 40 books 25mm wide can fit on a shelf 1 meter wide.
You can wind up with 10 different pairs of books in your hand, which you can choose from a shelf of 5 books in 20 different ways.
120. You do 5*4*3*2*1=120. you multiply the number that you are given for example how many times can books 3 be arranged on a shelf you multiply 3*2*1=6 that is your answer
25mm * 8 = 200 mm = 200/1000 metres = 0.2 metres.
240. 120 ways with the books stacked verticly, and 120 ways with the books stacked horizontaly, or one on top of the other.
25 mm = 0.984252 in 25 mm ≈ approximately 63/64" There are approximately 984 thousandths of an inch in 25mm!