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S3 = a + a + b + a + 2b
S3 = 3a + 3b
21 = 3a + 3b
sederhanakan(bagi 3 semua)
7 = a + b
S5 = a + a + b + a + 2b + a + 3b + a + 4b
S5 = 5a + 10b
60 = 5a + 10b
sederhanakan(bagi 5 semua)
12 = a + 2b
eliminasikan
12 = a + 2b
7 = a + b -
5 = b
maka jawabannya, b = 5 (b)