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Todd has 18 pens and a pencil box.
When Todd puts `2/3` of the pens into the pencil box, the pencil box weighs 0.06 kg less than it would if Todd had placed all of the pens into the pencil box.
If the mass of the pencil box is 4 times the mass of a pen, find the total mass of the pencil box in grams when it contains all the pens Todd has.