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The number of books in Kara's collection is divisible by 2,4,5, and 10.She has more than 11 books and less than 25 books. How many books does she have?

Guest Aug 27, 2015

Best Answer 

 #2
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+5

This just sounds more complex than it actually is; since the question doesn't tell this, I assumes only whole numbers.
starting with the numbers that couldn't be halved, then the same for the second round (the column that starts with two. we're now on the third column). Since only one of these visibly go up to five everything else is excluded; the final column is just because it was in the question

  2 4 5 10
12 6 3 - -
14 7 - - -
16 8 4 - -
18 9 - - -
20 10 5 4 2
22 11 - - -
24 12 6 - -

Answer: Kara has 20 books

Guest Aug 28, 2015
 #1
avatar
+5

The number of books in Kara's collection is divisible by 2,4,5, and 10.She has more than 11 books and less than 25 books. How many books does she have?

She has 20 books because that's the LCM for 2, 4, 5 and 10

 

 

Guest Aug 27, 2015
 #2
avatar
+5
Best Answer

This just sounds more complex than it actually is; since the question doesn't tell this, I assumes only whole numbers.
starting with the numbers that couldn't be halved, then the same for the second round (the column that starts with two. we're now on the third column). Since only one of these visibly go up to five everything else is excluded; the final column is just because it was in the question

  2 4 5 10
12 6 3 - -
14 7 - - -
16 8 4 - -
18 9 - - -
20 10 5 4 2
22 11 - - -
24 12 6 - -

Answer: Kara has 20 books

Guest Aug 28, 2015

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