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b = 5
Un = a + (n - 1) b
395 = 205 + (n - 1) 5
395 = 205 + 5n - 5
395 = 200 + 5n
395 - 200 = 5n
195 = 5n
195 / 5 = n
n = 39
S39 = n / 2 (a + U39)
= 39 / 2 (205 + 395)
= 39 / 2 * 600
= 11.700
soal UN , aku juga gini