Xiao Ming buys stationery with 10.2 yuan, and buys 6 pencils at 0.45 yuan each, and the rest of the money to buy ballpoint pens at 2.5 yuan each. How many can you buy?
小明用10.2元买文具，买了6支铅笔，每支0.45元，余下的钱买圆珠笔，每支2.5元，可以买多少支？
<gadget id="calculator">0.45 * 6</gadget>
<output>2.7</output>

<gadget id="calculator">10.2 - 2.7</gadget>
<output>7.5</output>

<gadget id="calculator">7.5 / 2.5</gadget>
<output>3</output>

<result>3</result>