Tomorrow, last year's graduates accounted for (1/5) of the whole school, and 120 new students were recruited. At this time, the number of students was only the original number (9/10), and this year they graduated again (1/6). How many graduates are there this year? ?
明天小学去年毕业生占全校人数的(1/5)，又招新生120人，这时学生人数只有原来人数的(9/10)，今年又毕业(1/6)，今年毕业生有多少人？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(9/10) - 1</gadget>
<output>-1/10 = around -0.1</output>

<gadget id="calculator">(1/5) + (-1/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">120 / (1/10)</gadget>
<output>1_200</output>

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

<gadget id="calculator">1_200 * (9/10) * (1/6)</gadget>
<output>180</output>

<result>180</result>