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Verified answer
Ibu = xbapak=y
anak=z
x=z+25
y=x+5
x+y+z=91
z+25+5+z+25+z=91
3z+55=91
3z=91-55
=36
z=12
a.umur sekarang
anak =z = 12 tahun
ibu =z+25 = 12+25 =37 tahun
ayah=ibu+5 =37+5 = 42 tahun
b.umur ibu 5 tahun lalu =37-5 = 32 tahun