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s × 40% = 18
s × 40/100 = 18
s = 18 × 100/40
s = 18 × 10/4
s = 9 × 10/2
s = 9 × 5
s = 45
Jadi jumlah siswa di data anak adalah 45 anak.
80% = 36anak
20% = 9anak
80% + 20% = 100%
100% = 36anak + 9anak = 45anak