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burhan= y
cheryl= z
x+y=25
x+z= 28
------- (dikurang)
y-z= -3
y-z= -3
y+z= 29
-------(dikurang)
-2z = -32
z= 16
jadi umur cheryl 16
x+z= 28
x+16=28
x=28-16
x= 12
umur amir 12
x+y = 25
12+y=25
y=25-12
y= 13
umur burhan 13