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7/11 x = 21
7x = 21(11)
7x = 231
x = 231/7
x = 33
Adik
= 4/11 x
= 4/11 (33)
= 132/11
= 12 tahun
Cara 2 :
21/7 = x/4
3 = x/4
x = 3(4)
x = 12
Semoga bermanfaat :)
Ahmad=7 per 3 di kali 21=49
Adik=4 per 3 di kali 21=28