###Human: Julian has 400 legos and wants to make lego models of two identical airplanes. If each airplane model requires 240 legos, how many more legos does Julian need?, ### Assistant: Two aeroplanes require 240 legos/airplane x 2 airplanes = 480 legos.
Julian needs 480 legos - 400 legos = 80 more legos 
 So the answer is :  80