The amount of money Diego paid is required.
The amount of money Diego paid was 52 dollars.
The cost of 3 books is 13 dollars
[tex]3\ \text{books}=13\ \text{dollars}[/tex]
[tex]1\ \text{book}=\dfrac{13}{3}\ \text{dollars}[/tex]
Diego bought 12 books
[tex]12\ \text{books}=12\times \dfrac{13}{3}=52\ \text{dollars}[/tex]
The amount of money Diego paid was 52 dollars.
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