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?
A step-by-step solution is:
80
Two aeroplanes require 240 legos / airplane x 2 airplanes = 480 legos.

Julian needs 480 legos - 400 legos = 80 more legos.

.

The final answer: 80