Create string by calculating other strings

MsgBox Evaluate(strValue & strCalculation)

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so you need the value of the expression 200.50 / 5 / 4 = 200.50 / 20 = 10.025 ?

to get the value of strValue, use : val(strValue)
to perform the calculations however depends on how far you would want to go. building a complete mathematic parser will take you a lot effort.
When the calculations are simple (eg. only dividing or multiplying), it can be done like :

strValue = "200.50"
strCalculation = "/5/4"

numerator = Val(strValue)
While Left(strCalculation, 1) = "/"
    pos = InStr(Mid(strCalculation, 2), "/")
    If pos > 0 Then
        denominator = Val(Mid(strCalculation, 2, pos - 1))
    Else
        denominator = Val(Mid(strCalculation, 2))
    End If
    numerator = numerator / denominator
    If pos > 0 Then
        strCalculation = Mid(strCalculation, pos + 1)
    Else
        strCalculation = ""
    End If
Wend
Result = numerator

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hrm,

never mind ;-)