I don't know if I understand the question but I think it is 15
Setting it up, we have Dan + Bret + Maria all saving 600.00
Dan = 2B
Bret = B
Maria = B+60
2B + B + B + 60 = 600
4B = 540
B = 135
Dan = 2(135) = 270
Brett = 135
Maria = 135 + 60 = 195
Answer:
540 degrees in a pentagon
4 + 8 + 6 + 4 + 5 = 27
540/27 = 20
4 X 20 = 80 degrees
8 X 20 = 160 degrees
6 X 20 = 120 degrees
4 X 20 = 80 degrees
5 X 20 = 100 degrees
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If the first one is a = 180 - b, and not 180 - 6, then that is correct.
Also, 360 = 2a + 2b is correct