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The average of three numbers is 69. The average of four different numbers is 90. What is the weighted mean of all the numbers together? 79 81 83 84

Mathematics
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The sum of the three numbers is 69 * 3 The sum of the four numbers is 90 * 4 The weighted mean is found by adding the above two results and dividing that total by 3 + 4 = 7\[weighted\ mean=\bar{x}=\frac{(69\times 3)+(90\times 4)}{7}=you\ can\ calculate\]
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