not an issue

Below code works fine in my IDE and when I give input as 3, its printing "Far". However, in the website, its shown nil output.

def multiples(x)
#Go on
if x%49 == 0 and x%3 == 0
puts "Fang"
elsif x%7 == 0
puts "fizz"
elsif x%15 == 0
puts "Foo"
else
puts "Far"
end
end