Yaoyao and Tingting have a rope skipping competition. Tingting jumped 490 times in three times, and Yaoyao jumped 158 times in the first two times. How many times does she have to jump the third time to get the same number as Tingting?
瑶瑶和婷婷比赛跳绳．婷婷三次共跳了490下，瑶瑶前两次都跳了158下，她第三次要跳多少下才能和婷婷一样多？
<gadget id="calculator">158 * 2</gadget>
<output>316</output>

<gadget id="calculator">490 - 316</gadget>
<output>174</output>

<result>174</result>