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XB= 75/72X
XA : XB = 68 : 80
XA = 68/80XB
XA = 68/80 * 75/72X
XA =255/288X
XA(A) + XB(B) / (A+B) = X
255/288X (A) + 75/72X(B) = X(A) + X(B)
(75/72-7272)X(B) = (288/288- 255/288)X(A)
3/72X(B) = 33/288X(A)
33/288X(A) = 3/72X(B)
A / B = 3/72 * 288/33
A:B = 864 : 2.376 = 4 : 11....B