Let U = the number of videos Uma watched

Ekon = U - 17

Kelsey = (U - 17) + 43 = U + <<(-17)+43=26>>26

U + U - 17 + U + 26 = 411

3U + 9 = 411

3U = 402

U = <<134=134>>134

Kelsey = 134 + 26 = <<134+26=160>>160 videos

Kelsey watched 160 videos.

# Answer

160
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
160
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?
train