Question 1072060
Let: X + Y + Z = 65
     X = Y - 10
     Z = 0.30 * ( X + Y )
Then:
Z = 0.3 * ( (Y - 10) + Y )
Z = 0.3 * ( 2*Y - 10 ) = 0.6*Y - 3
(Y - 10) + Y + 0.6*Y - 3 = 65
2.6*Y - 13 = 65
2.6*Y = 78

Y = 78 / 2.6 = 30
X = Y - 10 = 20
Z = 0.3 * 50 = 15