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U5 = 35 - 24
U5 = 11
a + 4b = 11
a = 11 - 4b
S4 = 4/2 (2a + 3b)
24 = 2 (2a + 3b)
12 = 2a + 3b
2a + 3b = 12
2(11-4b) +3b = 12
22 - 8b +3b = 12
-5 b = -10
b = 2
a = 11 - 4b = 11 -8 = 3
U15 = a + 14b
= 3 + 14(2)
= 31