There are 140 fifth-grade students participating in the tug-of-war competition, and its (3/7) is exactly the number of sixth-grade students (3/10). How many people are there in the sixth grade?
五年级学生有140人参加拔河比赛，它的(3/7)正好是六年级学生人数的(3/10)．六年级一共有多少人？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/7) / (3/10)</gadget>
<output>10/7 = around 1.428571</output>

<gadget id="calculator">140 * (10/7)</gadget>
<output>200</output>

<result>200</result>