Yesterday, Uncle Welly was able to plant 50 + 20 = <<50+20=70>>70 roses.

Today, he planted 2 x 50 = <<2*50=100>>100 roses.

Therefore, Uncle Welly has 50 + 70 + 100 = <<50+70+100=220>>220 roses planted on his vacant lot.

# Answer

220
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Two days ago, Uncle Welly planted 50 roses on his vacant lot. Yesterday, he planted 20 more roses than the previous day. Today, he planted twice the number of roses than two days ago. How many roses did Uncle Welly plant in his vacant lot?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
220
Two days ago, Uncle Welly planted 50 roses on his vacant lot. Yesterday, he planted 20 more roses than the previous day. Today, he planted twice the number of roses than two days ago. How many roses did Uncle Welly plant in his vacant lot?
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