Qianqian took 6 yuan to buy stationery, bought 4 pencils, each pencil was 0.8 yuan, and the remaining money was used to buy drawing paper, each piece was 0.4 yuan, how many pieces of drawing paper can be bought.
芊芊拿了6元钱去买文具，买了4支铅笔，每支铅笔0.8元，剩下的钱去买图画纸，每张0.4元，可以买多少张图画纸．
<gadget id="calculator">0.8 * 4</gadget>
<output>3.2</output>

<gadget id="calculator">6 - 3.2</gadget>
<output>2.8</output>

<gadget id="calculator">2.8 / 0.4</gadget>
<output>7</output>

<result>7</result>