Give the step-by-step reasoning process and then the final answer. 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?
The sum of his scores across the first 3 subjects is 50 + 70 + 66 = 186. The average score over the 3 subjects which is his History score is = total / 3 = 186 / 3 = 62. Therefore his score across all 4 subjects = 186 + 62 = 248.
The final answer: 248.