Enginpasa1 wrote: 1.3a/b>0

you can ignore the '3': if 3a/b is positive, then a/b must also be positive.

interpretation: if the quotient a/b is positive, then a and b are either both positive or both negative.

therefore,
rephrase of statement 1: a and b have the same sign

Enginpasa1 wrote:2.b/c^2<0

the quantity c^2 is always positive, so let's rephrase this one to
b/(positive #) < 0
which means that b must be negative.

therefore,
rephrase of statement 2: b is negative

together, these statements mean that a must also be negative.