The students visited the planetarium, 120 people went to the fifth grade, the number of the sixth grade went to the fifth grade (5/6), and the number of the fourth grade went to the sixth grade (3/4). How many people went to the fourth grade?
同学们参观天文馆，五年级去了120人，六年级去的人数是五年级的(5/6)，四年级去的人数是六年级的(3/4)．四年级去了多少人？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">120 * (5/6) * (3/4)</gadget>
<output>75</output>

<result>75</result>