Concept:Using the given average, first fix the total sum of the three quotations. Then check whether the statements together fix the exact value of the highest quotation.
Explanation:Let the quotations, in increasing order, be
p≤q≤r.
Given average
=Rs. 120; hence
p+q+r=120×3=360.
Statement (1): the lowest quotation is
Rs. 90. So
p=90 and
q+r=270.
Now
r is not fixed; for example,
(90,135,135) gives the highest quotation as
135, while
(90,100,170) gives the highest quotation as
170.
Therefore statement (1) alone is not sufficient.
Statement (2): one quotation is
Rs. 125. Then the other two quotations together sum to
360−125=235.
The other two could be
117.5 and
117.5, giving the highest quotation as
125.
Alternatively, they could be
80 and
155, giving the highest quotation as
155.
Thus statement (2) alone is also not sufficient.
Combining both statements: the lowest is
90 and one quotation is
125.
Since
125>90, the third quotation is
360−90−125=145.
So the three quotations are exactly
90,
125, and
145, and the highest quotation is exactly
145.
Now the required comparison can be answered with certainty.
Answer:Option (c): BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.