Jamie bought 4 math books that cost $12 each and some history books that cost $10 each. If she spent a total of $68, how many history books did she buy?
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Let x be the number of history books Jamie bought.
Then, the total cost of the math books is 4 * $12 = $48.
The total cost of the history books is x * $10.
The total cost of the math and history books is $48 + $10x.
We know that the total cost of all the books is $68.
Therefore, $48 + $10x = $68.
Subtract $48 from both sides: $10x = $20.
Divide by $10: x = 2.
Jamie bought 2 history books.