The small gear turns 85 times per minute, which is 2/3 more than the number of times the big gear turns per minute. How many times does the big gear turn per minute?
小齿轮每分钟转85周，比大齿轮每分钟转的周数多(2/3)，大齿轮每分钟转多少周？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 + (2/3)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">85 / (5/3)</gadget>
<output>51</output>

<result>51</result>