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