(29800 - 3800 +7000) ÷(5 +3 +2÷2/3)
=33000÷11
=3000(元)这是每份的钱
3000×5 +3800 = 18800(元)甲
3000×3 - 7000 = 2000(元)乙
3000×2 ÷(1-1/3)=9000(元)丙
设甲X乙Y丙Z 则X+Y+Z=29800 (X-3800)/(Y+7000)=5:3 (X-3800)/(1-1/3)Z=5:2
三个方程,三个未知数,会了吧?
甲、乙、丙三个人原来各有存款x,y,z元
x+y+z=29800
(x-3800):(y+7000):(z/3)=5:3:2
解上面方程可得:
x=15586元
y=72元
z=14142元