21
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26 shells, 3 rows -> 5 per row with 1 remaining 19 pennies, 5 rows -> 3 per row with 4 remaining 17 balloons, 7 rows -> 2 per row with 3 remaining
If I am getting what you are saying, then no. 3 rows of 9 and 2 rows equals 5 rows. 5*9=45 and 7*9=63
no but it can be arranged in rows of 8
Either 5 rows of 7 students - or - 7 rows of 5 students. --------------------------------------------------------- or 1 row of 35 students or 35 rows of 1 student (like in an exam hall)
7x4 That's 28 all together.