using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine();

        decimal inbQuantity = 9;

        decimal outbQuantity = 3;

        decimal inbGrossWeight = 90;

        decimal inbNetWeight = 81;

        // With ratio

        decimal ratio = outbQuantity / inbQuantity;

        Console.WriteLine($"Ratio: {ratio}");

        Console.WriteLine();

        Console.WriteLine($"OutbGrossWeight: {inbGrossWeight * ratio}");

        Console.WriteLine($"OutbNetWeight: {inbNetWeight * ratio}");

        Console.WriteLine();

        // Without ratio

        Console.WriteLine($"OutbGrossWeight: {inbGrossWeight * outbQuantity / inbQuantity}");

        Console.WriteLine($"OutbNetWeight: {inbNetWeight * outbQuantity / inbQuantity}");

        Console.WriteLine();

​

        // Func ratio, 

        var applyRatio = (decimal q) => q * outbQuantity / inbQuantity;

        Console.WriteLine($"OutbGrossWeight: {applyRatio(inbGrossWeight)}");

        Console.WriteLine($"OutbNetWeight: {applyRatio(inbNetWeight)}");

    }

}