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anak = y
bapak = y + 28
48 = y + y + 28
48 = 2y + 28
48-28 = 2y
20 = 2y
y = 20/2
y = 10
umur anak itu = y = 10 tahun
nomor 2
kita jadikan bilangan itu sbg p
3p/6 + 4 = 16
3p/6 = 16-4
3p/6 = 12
6(3p/6) = 6(12)
3p = 72
p = 72/3
p = 24