Question 1099228
.
Exactly this problem with the given data was solved at the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/word/misc/Had-they-sold.lesson>Had they sold . . .</A>, Problem 4

in this site.


<U>The answer is</U>:  &nbsp;&nbsp;60 boys;  &nbsp;12 &nbsp;rows and &nbsp;5 &nbsp;boys in each row.