Shakira went bowling with her friends. she paid $3 to rent shoes and then $4.75 for each game of bowling. if she spent a total of $21, then how many games did shakira bowl?

You simply need to subtract 3 dollars from twenty one, which would be 18.
Now you divide 18 by 4.75. Which is 3.78.
With this result, you just need to round it off, money wise. So she paid for 3 games. 

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