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30 kg selama 15 hari oleh 6 orang
40 hari oleh 6 orang = ??
30/15 = ??/40
?? = 30/15 x 40
?? = 80 kg
2. 3s + 5 = 41 tahun
3s = 41 - 5
s = 36 : 3
s = 12 tahun
3. 2x + 7 < 11
3x + 9 > 99
7x + 3 < 2