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u8 = a + 7b = 20
kuragkan
7b - 3b = 20 - 4
4b = 16
b = 4
a) U15 = U8 + 7b = 20 + 7(4) = 48
b) S12 = 12/2 ( a +U12)
S12 = 6 ( 2a + 11 b)
S12 = 6 (U4 + U8 +b) = 6(4 + 20+ 4)=168