设甲、乙、丙分别为a.b.c,
a+b+c=35 ①
2a-b=5 ②
b/3=c/2 ③
把b=2a-5,c=2b/3代入1式
(b+5)/2+b+2b/3 =35
解得,
b=15
a=10
c=10