The total amount Ellen paid for the book $16.21
Hope this helps!!
Since there are 2 sides to the shelf, there is 0.05*2=0.05+0.05=0.1 meters of space between the shelf and wall in total. Next, since each piece of wood is 0.3 meters wide and we have 3 of them, the total width of the wood is 0.3+0.3+<something>
Note that <width of wood>+<space between shelf and well> =width of closet
I challenge you to finish this on your own - good luck, and feel free to ask with any further questions!
\left[x \right] = \left[ \frac{3}{8}\right][x]=[83] totally answer
Rules for adding: if the bases are the same you can add them, and subtracting happens in a fraction
