There are 81 eggs in a basket, the first customer buys (1/9), the second customer buys the rest (1/8), the third customer buys the rest (1/7), and the second customer buys the rest (1/7). Four customers buy the rest (1/6), how many eggs are left in the basket?
一篮子鸡蛋有81个，第一位顾客买走(1/9)，第二位顾客买走剩下的(1/8)，第三个顾客买走剩下的(1/7)，第四位顾客买走剩下的(1/6)，这时篮子里还剩多少个鸡蛋？
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">1 - (1/9)</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 - (1/7)</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">81 * (8/9) * (7/8) * (6/7) * (5/6)</gadget>
<output>45</output>

<result>45</result>