If you look at both statements, they only compare which one is greater than which...but we need to know their signs to find out whether m+z is greater than zero so dont even think A , B or Dddo wrote:Is m+Z>0?
1 m-3z>0
2 4z-m>0
which is the best way to approach this Q? I picked nbrs but was really time consuming.
anshulseth wrote:I used the following reasoning and got to a diff answer.
a. m-3z>0
b. 4z-m>0
combining both
m>3z
and 4z>m
thus 3z<m<4z.
Thus m can be any value between 3z and 4z. Lets assume 3.5z.
So, m+z = 3.5 z + z = 4.5 z
Now, as we dont know anything about z, whether it is positive, negative or zero, we can't answer the question.
So, E.
Please point out any flaw in my reasoning.
"we dont know anything about z"bsandhyav wrote:anshulseth wrote:I used the following reasoning and got to a diff answer.
a. m-3z>0
b. 4z-m>0
combining both
m>3z
and 4z>m
thus 3z<m<4z.
Thus m can be any value between 3z and 4z. Lets assume 3.5z.
So, m+z = 3.5 z + z = 4.5 z
Now, as we dont know anything about z, whether it is positive, negative or zero, we can't answer the question.
So, E.
Please point out any flaw in my reasoning.
I did exactly the same thing and got the answer wrong. Can anybody pls explain wot is wrong with the approach!!
Experts pls help !
Generallybsandhyav wrote:Can anybody clear this concept for me?
we have 3z<m<4z; the signs will remain the same if z is +ve.
But what if z is -ve?
