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Elementary school students' fifth-grade math problems
The total cloth is equal

Later cloth =3.8-0.2=3.6 meters.

Late total amount = 3.6 * 190 = 684m.

Number of original sets =684/3.8= 180 sets.

Together, that is to say,

(3.8-0.2) *190/3.8 =180 sets