If: 5b = 30
Then: b = 6
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Six take away B times five B plus 30 equals 1. This is a math problem.
10a - 5b = 25 So 5b = 10a - 25 and hence b = 2a - 5
7b + 16 = 5b + 247b - 5b = 24 - 162b = 8b = 4
b=7
Add the equations: 4a + 4a - 5b + 5b = 7 + 17 ie 8a = 24 a = 3, so b = 1