var units = "years"; var davidage = 65; var johnage = 40; var agedifference = davidage - johnage; alert("the age difference is " + agedifference + " " + units);
0
var units = "years"; var davidAge = 65; var johnAge = 40; var ageDifference = davidAge - johnAge; alert("The age difference is " + ageDifference + " " + units);