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#6 Languages, 38 / 6^3 = 0.176 ###Whitespace, Brainfuck, Ruby, Labyrinth, Foo, Seriously

puts•2;#4!@•-[>+<-----]>6.§"5"•£ £ •£ 

###Whitespace

#6 Languages, 38 / 6^3 = 0.17592̅5̅9̅ ###Whitespace, Brainfuck, Ruby, Labyrinth, Foo, Seriously

puts•2;#4!@•-[>+<-----]>6.§"5"•£ £ •£   

###Whitespace

Try it online. (Note: my program omits the closing three linefeeds to terminate the program, I wrote/tested this on Whitelips and that produces the proper output there, but does not on Try It Online, so the linked program has those two characters added. As far as I can tell, some interpreters let you do that, others get stuck in an infinite loop without the explicit termination)

#6 Languages, 38 / 6^3 = ###Whitespace, Brainfuck, Ruby, Labyrinth, Foo, Seriously

#6 Languages, 38 / 6^3 = 0.176 ###Whitespace, Brainfuck, Ruby, Labyrinth, Foo, Seriously

#5 Languages, 32 / 5^3 = 0.28 ###Whitespace, Brainfuck, Ruby, Labyrinth, Foo

•: space

puts•2;#4!@ -[>+<-----]>."5"•£ £ •£  

##Explanation:

###Brainfuck

###Labyrinth

puts•2;#4!@ -[>+<-----]>"5".•£ puts• skipped 2 push 2 onto stack ; pop 2 from stack # push current stack depth (0) to stack 4 push 4 to stack ! print top of stack as integer @ program terminates 

###Foo

#6 Languages, 38 / 6^3 = ###Whitespace, Brainfuck, Ruby, Labyrinth, Foo, Seriously

•: space

§: 0x7f

puts•2;#4!@•-[>+<-----]>6.§"5"•£  £ •£ 

This contains unprintable characters, so here's the hexdump:

7075747320323b23342140202d5b3e2b3c2d2d2d2d2d5d3e362e7f22352220090a090a20090a

##Explanation:

###Brainfuck Try it online.

###Labyrinth Try it online.

puts•2;#4!@ -[>+<-----]>6.§"5"•£ puts•  skipped 2  push 2 onto stack ;  pop 2 from stack #  push current stack depth (0) to stack 4  push 4 to stack !  print top of stack as integer @  program terminates 

###Foo Try it online.

###Seriously Try it online.

puts•2;#4!@ -[>+<-----]>6.§"5"•£ puts•2;#4!@ -[>+<-----]> assorted stack manipulation that doesn't affect this program 6 push 6 to the stack . output top of the stack § (0x7f) terminate program