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ATQ;
Let the three numbers be x, y, and z.
So,
2x+y+z=450×2=900
x+2y+z=420×2=840
x+y+2z=400×2=800
Thus,
4×(x+y+z)=2640
x+y+z=660
Now,
x=900−660=240
y=840−660=180
z=800−660=140
Desired difference = 240−140=100
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