Question 388272
Let x=number of matches needed to fill each box.
Then 24x=total number of matches

When x-4 matches are put in each box, then we have a total of 28(x-4)matches
Soooo
28(x-4)=24x
28x-112=24x subtract 28x from each side
-4x=-112
x=28 number of matches needed to fill one box
CK
24*28=28*24
 672=672

Hope this helps---ptaylor