Quant Question of the Day Chat

Easiest way to do this imo is to test values:


Target: Z=?

1) z is R when y/y-1, y is an int >0.
testing: y=2, 2/1, R0 (z=0), y=3, (3/2), R1, (z=1). Therefore, NS. We have two cases.
2) y is non-prime. no info about X, insuff.
3) since y is non-prime, we can exclude the case of y=2. Let’s test some more values:
y=6, 6/5, R1 (z=1)
y=8, 8/7, R1 (z=1)
y=9, 9/8, R1 (z=1)
Clear pattern here. Therefore, C.


Almost... the case of y=2 makes A NS.

PS Question 2 - Nov 23

If integer k is equal to the sum of all even multiples of 15 between 295 and 615, what is the greatest prime factor of k?

A. 5
B. 7
C. 11
D. 13
E. 17

Source: Manhattan | Difficulty: Hard

Even multiples of 15 from 295 to 615 are 300, 330, 360 .... 570, 600
Total numbers = (600-300)/30 + 1 = 11
Sum = 11/2 (300+600) = 11/2 * 900 = 11*450 = 11*9*25*2 = 2*(3^2)*(5^2)*11
Hence, 11 is the greatest prime factor

C


C. $16


if y = 2, then y/(y-1) has remainder as 0. rest all cases remainder is 1. combining both statement addresses this outlier, hence C

Renamed the group to "Quant Question of the Day" per suggestion from one of the users. Let me know if any issues with the new name

so will the format of posting questions change ? i mean only one PS and one DS question will be posted in a day?

No, I don’t think so, it is just a marketing gimmick

Hopefully something catchier than Quant Chat but welcome ideas from more talented marketers. My skills tend to suck at 11 PM

PS Question 1 - Nov 24

What is the angle between the minute and the hour hand of the clock which shows 12:24?

A. 115
B. 120
C. 124
D. 130
E. 132

Source: GMAT Club Tests | Difficult : Medium

It’s that time of the year y’all!! Happy Thanksgiving!

Thank you bb for creating this wonderful community and a million thanks GMAT Club experts and members for sharing great insights and advice on every topic.

Happy Thanksgiving everyone !

#ForeverGrateful

Note: GMATClub Tests are open today (24 Nov) for 24 hours. So if you wish to try out some challenging quant & verbal questions, you know where to go

It’s that time of the year y’all!! Happy Thanksgiving!

Thank you bb for creating this wonderful community and a million thanks to GMAT Club experts and members for sharing great insights and advices on every topic.

Happy Thanksgiving everyone !

#ForeverGrateful

Note: GMATClub Tests are open today (24 Nov) for 24 hours. So if you wish to try out some challenging quant & verbal questions, you know where to go

E. 132

12:24 - the hour hand makes an angle of (24/60)*(360/12) = 12
the minute hand makes an angle of (24/60)*(360) = 144
Difference = 144-12 = 132

DS Question 1 - Nov 24

If m is a two-digit positive integer and 2*m is a three-digit positive integer, what is the units digit of m ?

(1) The units digit of 2*m is 4.
(2) The units digit of m equals to to the tens digit of 2m

Source: Others (DS Butler) | Difficulty: Medium

Statement 1: If units digit of 2m is 4, then the units digit of m can be either 2 or 7. Take 62, 2*62=124. Take 67, 2*67=134. Eliminate A and D.

Statement 2: If units digit of m equals to tens digit of 2m, then m can either be 62, 2*62=124 or 74, 2*74=148. Ofcourse these are just 2 such examples. Eliminate B.

Now, m is either of 52, 57, 62, 67, 72, 77, 82, 87, 92, and 97. Of these when you do 2m, you get 104, 114, 124, 134, 144, 154, 164, 174, 184, and 194. We see that 62 and 87 meet both the conditions, hence answer is E.

DS Question 2 - Nov 24

Can a cube of volume x be fitted inside the cylinder?

(1) Side of the cube and diameter of the base of the cylinder are in ratio 3:4.

(2) If the volume of the cylinder is increased by 50%, 3 cubes, each having its volume equal to x can be fitted inside the cylinder.

Source: GMATWhiz | Difficulty: Hard

PS Question 2 - Nov 24

If c and d are both integers, c>d, and -3c>19, then the largest value of d would be?

A. -5
B. -6
C. -7
D. -8
E. -10

Source: EMPOWERGmat | Difficulty : Hard

D

E