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I believe this is a question you will never see on the GRE.
Basically, it tests nothing. It is just a matter of the sum.
The red column are the towel imported from ALL over the world. ALL means also China, right ? It is a country on this planet
Of this grand total 68, 46 are from China. So those towels imported in Japan NOT from china, are 68-46=22
one dozen is 12 units
22*12=264
I hope now is more clear