Q1.
Is r < 1?
(1) r > 0
(2) r^2 < 0
OA is B
My Answer is E:
stmt 1: r>0 => r>1 or 0<r<1 . Insufficient
stmt 2: r^2<0 => r is not a real number as all the square of any real number should be positive.
Q2.
If 5a = 9b = 15c, what is the value of a + b + c?
(1)3c − a = 5c − 3b
(2)6cb = 10a
OA is E
My Answer is C: Each statement alone is clearly insufficient.
stmt 1 x10: 30c-10a=50c-30b
Substitute stmt 2 in 1: 30c-6cb=50c-30b => 30b-20c=6cb
From the first given => c=(3/5)b ..... Substitute in the above equation
30b - 12b=6cb ..... Factor and reduce b
=>6c=18 => c = 3
Hence, a= 9 and b = 5 and a+b+c= 17 .
Therefore, the 2 statements together are sufficient.
What is wrong with my answer and why the OA is E
Please help in the above questions.
Is r < 1?
(1) r > 0
(2) r^2 < 0
OA is B
My Answer is E:
stmt 1: r>0 => r>1 or 0<r<1 . Insufficient
stmt 2: r^2<0 => r is not a real number as all the square of any real number should be positive.
Q2.
If 5a = 9b = 15c, what is the value of a + b + c?
(1)3c − a = 5c − 3b
(2)6cb = 10a
OA is E
My Answer is C: Each statement alone is clearly insufficient.
stmt 1 x10: 30c-10a=50c-30b
Substitute stmt 2 in 1: 30c-6cb=50c-30b => 30b-20c=6cb
From the first given => c=(3/5)b ..... Substitute in the above equation
30b - 12b=6cb ..... Factor and reduce b
=>6c=18 => c = 3
Hence, a= 9 and b = 5 and a+b+c= 17 .
Therefore, the 2 statements together are sufficient.
What is wrong with my answer and why the OA is E
Please help in the above questions.
. Thanks alot.
