(6/7) of the poplars are cypresses, and (2/3) of the cypresses are pagoda trees. It is known that there are 140 poplars. How many pagoda trees are there?
杨树的(6/7)是柏树，柏树的(2/3)是槐树，已知杨树有140棵，槐树有多少棵？
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">140 * (6/7) * (2/3)</gadget>
<output>80</output>

<result>80</result>