= 13/ 10

=3/ 10

Analysis: 1+2 =2/5 2+3 =9/ 10 1+2+2+3 = 2/5+9/10 =13/.

(one+two+two+three)-(one+two+three) =13/10-1= 3/10.

A: The number of people who won the second prize accounted for three-tenths of the total number of awards.

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