Data Sufficiency

kstv wrote:2) to guarantee that each clerk will complete in 1 hour, the number of gifts should be the minimum i.e. 20 gifts to be wrapped by each. 9 clerks wrap 20 gifts = 180 gifts in total. But actual no of clerks in not known. Insuff

1) Each person in line has alteast one gift but total no of gifts cannot be ascertained. Insuff

Combining 1 and 2 we know there are 180 gifts and 6 clerks i.e 30 gifts have to be wrapped by each. 30 is the maximum that can be wrapped by each clerk. So it is possible in one hour.

IMO C.

2. If each clerk in line had one more present to be wrapped. 9 clerks would be required to guarantee that every present would be wrapped in 1 hour.
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The second statement is not clear - looks like something is wrong in the wordings. Did each customer in line had one more present or did each clerk had one present left unwrapped?

iamseer wrote:In 1 hour, min 20 gifts and max 30 gifts can be wrapped by one clerk.
To find if all presents of the 70 people would be wrapped we need to find the total number of presents and total number of clerks.

ABCDE
from 1:
each person has at least 1.... so number of presents per person in queue could be 1... could be 100....
Number of clerks =6
So, Not Sufficient

BCE
from 2:
if one present more per clerk, 9 clerks required to guarantee. therefore NEW number of presents = 9*20=180. Therefore original number of presents = 180-9=171

We still don't know, how many clerks are there for sure.
So, Not Sufficient

CE
Combining 1 and 2:
Number of clerks:6
Number pf presents: 70*(summation of 70 numbers >=1) = 171

Now 6 clerks can wrap a minimum of 120 and maximum of 180. B'cos 120<171<180, all presents could be wrapped or not be wrapped depending upon how many presents each clerk wraps.

Not Sufficient

IMO answer E

If number was less than 120.... a definite Yes was possible
If number was greater than 180... a definite NO was possible

amer siddiqui wrote:bupbebeo - what's the answer and where did you see this q?

amer siddiqui wrote:I see, thanks! IS it possible to set out the explanation from Kaplan as to how the two statements together are sufficient?

bupbebeo wrote:at a certain department store present-wrapping counter. Each clerk will wrap no fewer than 20 and no more than 30 presents per hour. If 70 people are standing in line, will all of their presents be wrapped after 1 hour.

1. Each person in line has at least 1 present to be wrapped by one of the six clerks at the counter


2. If each clerk in line had one more present to be wrapped. 9 clerks would be required to guarantee that every present would be wrapped in 1 hour.

bupbebeo wrote:at a certain department store present-wrapping counter. Each clerk will wrap no fewer than 20 and no more than 30 presents per hour. If 70 people are standing in line, will all of their presents be wrapped after 1 hour.

1. Each person in line has at least 1 present to be wrapped by one of the six clerks at the counter


2. If each clerk in line had one more present to be wrapped. 9 clerks would be required to guarantee that every present would be wrapped in 1 hour.