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We know that, A + B=110 But 20 years ago, A-20 + B-20 = 110-40 So we can say that, A-20 + B-20 =4:3 and let the common multiple for 4:3 be x 4x +3x=110-40 7x =70 x =70/7 x =10 so, 4x=4*10=40=A-20 so, 40=A-20 60=A