Official Quant thread for CAT 2013

anantn · January 22, 2013, 2:20pm

@Shray14 49?

EDIT:ah crap, calculation error, ......50 is the answer

mailtoankit · January 22, 2013, 2:22pm

@Shray14 said:
In a class of 45 students, 30 are boys and remaining are girls. If the mean weight of girls is 45 kg and that of boys is 52 kg, then the mean weight of entire class (in kg) is nearest to (1) 48 (2) 49 (3) 50 (4) 51

49.67=50?

pirateiim478 · January 22, 2013, 2:22pm

@anantn said:
A 5 rupee coin with diameter 2 cm and width .5cm, is tossed into the air. What is the probability of it landing vertically on its thinner side.

What is landing vertically on its thinner side?? Is answer 0

anitito123 · January 22, 2013, 2:25pm

@Shray14 50.These questions are from GBO paper.

anantn · January 22, 2013, 2:26pm

basically landing vertically on its edges,and no answer is not 0.

shray14 · January 22, 2013, 2:29pm

@anitito123 said:
@Shray14 50.These questions are from GBO paper.

yes..from GBO paper..

anitito123 · January 22, 2013, 2:30pm

A travelled a total ditance of 3990km.He travelled part of the distance by air,part by water and rest by land.The time he spent on them was in the ratio 1:16:2 respectively.The average speed in each mode of travel was in the ratio 20:1:3 respectively.If A's overall average speed was 42km/hr ,the distance covered by air is:
option: 2000, 1820, 1900, 1520 (all in km)

anitito123 · January 22, 2013, 2:31pm

@Shray14 said:
yes..from GBO paper..

All the best for GBO exam.

shray14 · January 22, 2013, 2:34pm

@anitito123 said:
All the best for GBO exam.

Same to u

gauravinflames · January 22, 2013, 2:36pm

@anitito123 1900kms

anantn · January 22, 2013, 2:36pm

@anitito123
1900

anantn · January 22, 2013, 2:37pm

the coin question
cmpn guys, help me with this one....it came in one of the b school interviews...

anitito123 · January 22, 2013, 2:40pm

@anantn @gauravinflames correct !!approach please

catconquerer · January 22, 2013, 2:40pm

@anitito123 1520??

ishu1991 · January 22, 2013, 2:41pm

@anitito123
1900

anitito123 · January 22, 2013, 2:41pm

@catconquerer OA is 1900.

anitito123 · January 22, 2013, 2:43pm

Water flows at the rate of 10m/min from a cylindrical pipe whose internal radius is 0.5cm. How long would it take to fill a conical vessel with top radius 20cm and depth 21cm.
options: 11.2 min, 22.4 min, 44.8 min, 89.6 min

cynara · January 22, 2013, 2:46pm

@anitito123 said:
Water flows at the rate of 10m/min from a cylindrical pipe whose internal radius is 0.5cm. How long would it take to fill a conical vessel with top radius 20cm and depth 21cm.options: 11.2 min, 22.4 min, 44.8 min, 89.6 min

11.2 min

gnehagarg · January 22, 2013, 2:47pm

@anitito123 said:
solve:2(root2+root6)/(3*root(2+root3))Options: 4/3, 1, 16/9, 2/3

2/3(rt2)*(rt3+1)*rt2/(rt(1+rt3)^2

4/3

anantn · January 22, 2013, 2:47pm

@anitito123
take the ratio coefficient of time as Y and speed as X.
average speed = total distance travelled/total time takenso
42= 3990/19y, y =5
Total distance =3990= x(20*5 +16*5 + 6*5)
x= 19. HENCE XY*20 = 1900