My solution:
using System;
class GravitationOnTheMoon
{
static void Main()
{
Console.WriteLine("Please enter your current weight: ");
double weightEarth = double.Parse(Console.ReadLine());
double weightMoon = weightEarth * 0.17;
Console.WriteLine("Your weight {0} kg. on the Moon will be: {1} kg.", weightEarth,weightMoon);
}
}