Bar Model in UEB math

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    I have attached a file of question #17 that says to "Complete the bar model and explain how to use it to find the unknown part."  In the attached file, you will see the two rectangles--one with a blank (I guess) and the other a shaded square. There's also a line that I think is showing that the two rectangles are connected.  Beneath that is another "blank".

    How should this be shown?  Using braille or tactile graphics?  What is the "blank"?

    Thank you,



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