Step 1
A tape diagram is a rectangular drawing that appears like a tape piece with divisions to support mathematical calculations. It is a graphic tool used commonly in solving ratio-based mathematical word problems. Tape diagrams are visual representations that represent the sections of a ratio by using rectangles.
Step 2:
![\begin{gathered} 21\text{ }(.)/(.)\text{ }(3)/(8) \\ =\text{ 21 }*\text{ }(8)/(3) \\ =\text{ 7 }*\text{ 8} \\ =\text{ 56} \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/t4803okeecr956gvealp5fnrxjw1ken5et.png)
Step 3
Let draw tape diagram
![\begin{gathered} Final\text{ answer} \\ =7\text{ }*\text{ 8} \\ =\text{ 56} \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/748umouawfr0e5nmxdenbyz1jkl779rvz2.png)