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1x20
2x10
4x5
Jadi, 1, 2, 4, 5, 10, 20
5. 4:5
Jumlah = 36
Jadi, 4n+5n = 36
9n = 36
n = 4
4n = 16
5n =20
a. 16
b. 20-16 = 4