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I would like to present this post who are looking for the expressions related to Arithmetic operator Min | Max | Sum | Average
Introduction
Aggregate expressions are used to make calculations over a specific set of records. For example, to calculate the total Quantity of all records, or the total number of records in the dataset.
Sum operator
SUM function can be extremely useful to calculate the sum of the items in a list/Collection
LINQ Expression
(From d in BuildDt.AsEnumerable Where Not (isNothing(d(1)) OrElse String.IsNullorEmpty(d(1).toString.Trim)) Select v = CDbl(d(1).toString.Trim)).Sum(Function (x) x)
Output
Average operator
The AVERAGE function can be used to find the average value of the items in a list/Collection.
LINQ Expression
(From d in BuildDt.AsEnumerable Where Not (isNothing(d(1)) OrElse String.IsNullorEmpty(d(1).toString.Trim)) Select v = CDbl(d(1).toString.Trim)).Average(Function (x) x)
Output
Minimum operator
MIN function can be used to find the minimum value in a list/Collection
LINQ Expression
(From d in BuildDt.AsEnumerable Where Not (isNothing(d(1)) OrElse String.IsNullorEmpty(d(1).toString.Trim)) Select v = CDbl(d(1).toString.Trim)).Min(Function (x) x)
Output
Maximum operator
MAX function can be used to find the maximum value in a list/Collection.
LINQ Expression
(From d in BuildDt.AsEnumerable Where Not (isNothing(d(1)) OrElse String.IsNullorEmpty(d(1).toString.Trim)) Select v = CDbl(d(1).toString.Trim)).Max(Function (x) x)
Output
You can find the sample workflow here
LINQ_ArithmeticOperator.xaml (9.3 KB)
Reference
Hope this will be helpful 
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Regards
Gokul