Students from class 4 and class 1 donated money to buy cotton clothes for the children in the disaster area. If you buy 40 yuan a piece, you can buy 21 pieces; if you buy 60 yuan a piece, how many pieces can you buy?
四1班同学为灾区小朋友捐款购买棉衣．如果买40元一件的，可买21件；如果买60元一件的，可买多少件？
<gadget id="calculator">21 / 60</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">40 * (7/20)</gadget>
<output>14</output>

<result>14</result>