Two DS Question

reachac · Posted: Wed Jul 23, 2008 5:03 am Post subject: Two DS Question

Please help with these two questions.[/img]

cubicle_bound_misfit · Posted: Wed Jul 23, 2008 6:59 am Post subject:

Hello Sir,

For the geometry q is the answer D?

Please let me know OA.

regards,

reachac · Posted: Wed Jul 23, 2008 7:10 am Post subject:

Yups OA is D, but how did u get that, I thot it should have been E coz I could find no way to get the area of the sector OAX. where X is the point of intersection of the diagonal and the circle.

cubicle_bound_misfit · Posted: Wed Jul 23, 2008 7:43 am Post subject:

you owe me one Smile

http://www.beatthegmat.com/set-q-1-t14264.html#58978

for the semicircle lenght of sector pi*R

you have to substract the rest of the sector with inscribed angle 45 degree.

regards,

reachac · Posted: Wed Jul 23, 2008 9:36 am Post subject:

Ohh u remember that question Smile

, well had sent u a PM explaining my stance.

Nehw comin back to this question, how can u say that OAX is a quarter circle (or for that matter how can u say that the inscribed angle is 45 degree) I see no basis for this being provided by the question or the options.

cubicle_bound_misfit · Posted: Wed Jul 23, 2008 11:05 am Post subject:

I am not saying oax is. I am saying the rest of the thing is.
So OAX = (length of semicircle - sector that has an inscribed angle of 45 degs.)

regards,

Canman · Posted: Wed Jul 23, 2008 11:43 am Post subject:

I think the ans on Q1 is E

Stem: We need to find number presents to wrap and range of presents that can be wrapped in 1 hr based on number of clerks available to wrap presents, to determine sufficiency.

1) tells us # range of presents that can be wrapped in 1 hr but not # of presents - INSUFFICIENT

ex: 6 clerks can wrap 120-180 presents in 1 hour

2) tells us # range of presents but not # of clerks available - INSUFFICIENT

ex: 70(p+1)=9(20), 70p=110=total presents to wrap based on rate of 20 per hour, or it may be 70(p+1)=9(30), 70p=200=total presents to wrap based on rate of 30 per hour

1+2) INSUFFICIENT because we know the clerks can wrap up to 180 per hour but we don't know if the shoppers have 110 or 200 presents to wrap

reachac · Posted: Wed Jul 23, 2008 8:41 pm Post subject:

airan · Posted: Thu Jul 24, 2008 2:45 am Post subject:

Asnwer for gift wrapping should be C ..
What is the OA ..and from next time onwards, pls avoid 2 questions in the same post...!

airan · Posted: Thu Jul 24, 2008 2:58 am Post subject:

Assuming AC cuts the semicircle at X, we wud need angle AOX to find the area of the minor sector AX.
A similar diagonal DB will also cut the circle at X( it being a square on diameter).

Now the area of semicircle is= are of triangle AXB plus 2 small sectors.
Area of triangle AXB can be found ..as it will be right triangle ..Hence area of the shaded region can be found .

B gives the same info as A hence D.