The sum of his scores across the first 3 subjects is 50+70+66 = <<50+70+66=186>>186

The average score over the 3 subjects which is his History score is = total/3 = 186/3 = <<186/3=62>>62

Therefore his score across all 4 subjects = 186+62 = <<186+62=248>>248

# Answer

248
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Henry scored 50 points on his Geography test, 70 on his Math test and 66 on his English test. If his History score is the average of these 3 scores, what was his total score across all 4 subjects?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
248
Henry scored 50 points on his Geography test, 70 on his Math test and 66 on his English test. If his History score is the average of these 3 scores, what was his total score across all 4 subjects?
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