Together 3 friends watched 411 short videos. Kelsey watched 43 more than Ekon. Ekon watched 17 less than Uma. How many videos did Kelsey watch?
Let U = the number of videos Uma watched.
Ekon = U - 17.
Kelsey = (U - 17) + 43 = U + 
<gadget id="calculator">(-17)+43</gadget>
<output>26</output>
26.
U + U - 17 + U + 26 = 411
3U + 9 = 411
3U = 402.
U = 
<gadget id="calculator">134</gadget>
<output>134</output>
134.
Kelsey = 134 + 26 = 
<gadget id="calculator">134+26</gadget>
<output>160</output>
160 videos.
Kelsey watched 160 videos.

<result>160</result>