A shoe store imports 60 pairs of leather shoes. The number of sports shoes brought in is more than leather shoes (1/5), and the number of slippers brought in is less than that of sports shoes (2/9). How many pairs of slippers are brought in?
某鞋店进皮鞋60双，运进的运动鞋比皮鞋多(1/5)，运进的拖鞋比运动鞋少(2/9)，运进的拖鞋多少双？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 - (2/9)</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">60 * (6/5) * (7/9)</gadget>
<output>56</output>

<result>56</result>