Question 903905
The tube is 7{{{5/7}}}long, or {{{54/7}}}long.
Each spacer must be {{{6/7}}} long.
IF you cut perfectly, you can get {{{54/6}}} pieces out of it.  {{{54/6}}}=9 pieces
<br>In real life, you always leave 10% for waste.
Remember, measure twice, cut once.