Question

x+y+z=111,y:x=3:2,y:z=5:4 求解

Answer 1

x=2/3y
z=4/5y

2/3y+y+4/5y=111
10/15y+y+12/15y=111
37/15y=111
y=111x15/37
y=45
x=2/3x45=30
z=4/5x45=36

Answer 2

y:x=3:2,
x=2/3y
y:z=5:4
z=4/5y
x+y+z=111
2/3y+y4/5y=111
y=45
x=30
z=36

Answer 3

设y=15a，则x=10a,z=12a,则

x+y+z=37a=111
a=3

x=30,y=45,z=36

Answer 4

X=30 Y=45 Z=36

Answer 5

x=2/3Y, z=4/5Y, 2/3y+y+4/5y=111 ,37/15y=111, y=45, x=30 , z=36