Guanghua Elementary School held a composition competition. There were 34 participants in the fourth grade, 51 participants in the fifth grade, and 74 participants in the sixth grade that were 1.8 times less than the total number of participants in the fourth and fifth grades. How many people in 6th grade attend?
光华小学举行作文竞赛，四年级有34人参加，五年级有51人参加，六年级参加的人数比四、五年级参加的总人数的1.8倍少74人．六年级有多少人参加？
<gadget id="calculator">34 + 51</gadget>
<output>85</output>

<gadget id="calculator">85 * 1.8</gadget>
<output>153</output>

<gadget id="calculator">153 - 74</gadget>
<output>79</output>

<result>79</result>