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It is given that there are 11 people in the elevator, which includes one adult and 10 children.
Let the adult weight be "x" and the child weight be "y".
It is said that the adult weight is 4 times higher than that of the childs weight.
Therfore adults weight = 4y and childs weight = y
Sum of their weights ==> 4y + y = 11
==> 5y = 11
Now by substituting the y value, for x, we get the weight of the adult.
x = 4y
Hence, the weight of the adult is 44/5
Thus, the solution.