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B=15
C=13
D=18
A'=?
B'=?
C'=?
D'=?
A'+C'=30
A+C=20
k=30/20=3/2
A'=A*3/2=7+3/2=10,5
B'=B*3/2=15*3/2=22,5
C'=C*3/2=13*3/2=19,5
D'=D*3/2=18*3/2=27
A'+C'=30
10,5+19,5=30