7
7 x 2 = 14
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Well, isn't that a happy little question! Let's see here... If we're trying to make 14 using rows of 2, we can count by twos until we reach 14. So, we have 2, 4, 6, 8, 10, 12, 14. It looks like we need 7 rows of 2 to make 14. Happy counting!
Having the same number of students in each row, 80 students can be arranged in 80 rows of 1, 40 rows of 2, 20 rows of 4, 10 rows of 8, and 5 rows of 16.
33 desks can be arranged into six rows having no rows, 1 row, 2 rows, 3 rows, 4 rows, or 5 rows with exactly 5 desks.
You can have: 1 row of 36 2 rows of 18 3 rows of 12 4 rows of 9 or 6 rows of 6, so in total there are 5 ways.
You can't
1 row of 12 12 rows of 1 3 rows of 4 4 rows of 3 2 rows of 6 6 rows of 2