117
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Well, darling, to find the average of a set of numbers, you add them all up and then divide by how many there are. So, in this case, you add 11 + 87 + 19, which gives you 117. Then you divide that by 3 (since there are 3 numbers), and you get an average of 39. And that's the tea, honey!
87 x 11 = 957
87 multiplied by 11 is 957.
The average is (98+87)/2 = 92.5
87-98 = -11