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y= umur sinta
jwb =
x-2= 2(y-2)
x-2= 2y-4
x-2y=-4+2
x-2y=-2
(x+5)+(y+5)=41
x+y+10 =41
x+y. =41+10=31
jadi
x-2y=-2
x+ y=31
------------ -
-3y=-33
y = 11 (umur sinta sekarang)
umur indra sekarang
x + y = 31
x + 11 = 31
x. = 31-11 = 20