Geeting "0" solution of an equation :(

Question

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace ConsoleApplication7

{

class Program

{

static void Main(string[] args)

{

Console.WriteLine("Enter Year of Construction:");

int Year = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("Enter Span of the Bridge:");

int Span = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("Enter the Slab thickness:");

int Thickness = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("Enter Width of the Bridge:");

int Width = Convert.ToInt32(Console.ReadLine());

if (Year < 1930)

{

float Thickness1 = (9 / 10) * Thickness;

Console.WriteLine(Thickness1);

Console.ReadLine();

}

}

}

}

i dont know why its giving 0 solution of Thickness1 Variable. please help. .i am newbie. sorry if it looks stupid.