Li Li spent 7.2 yuan to buy stationery, bought 4 pencils, each 0.75 yuan. The remaining money is used to buy drawing paper, 0.6 yuan per sheet, how many sheets did you buy?
李丽拿7.2元钱买文具，买了4支铅笔，每只0.75元．剩下的钱买图画纸，每张0.6元，买了多少张？
<gadget id="calculator">0.75 * 4</gadget>
<output>3</output>

<gadget id="calculator">7.2 - 3</gadget>
<output>4.2</output>

<gadget id="calculator">4.2 / 0.6</gadget>
<output>7</output>

<result>7</result>