There are 35 people in the dance group and 42 people in the vocal music group in the third grade of a certain elementary school. The number of people in the calligraphy group is twice the total number of the dance group and the vocal music group. How many people are there in the calligraphy group?
某小学三年级舞蹈组有35人，声乐组有42人，书法组的人数是舞蹈组和声乐组总数的2倍．书法组有多少人？
<gadget id="calculator">35 + 42</gadget>
<output>77</output>

<gadget id="calculator">77 * 2</gadget>
<output>154</output>

<result>154</result>