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Number Properties

Problem Solving

Easiest way is just to write down the numbers from 1-20 and check them smallest possible number will be 5 = 3+2 Lets take the next number 6. can it be expressed as sum of multiples of 2 and 3? NO 7 = 4+3 8 = 2+6 9 = 6+3 10 = 4+6 11 = 8+3 12 = 6+6 13 = 4+9 14 = 8+6 15 = 6+9 16 = 4+12 17 = 2+15 18 = 6...

by srcc25anu

Wed Jul 03, 2013 6:01 pm
Forum: Problem Solving
Topic: Number Properties
Replies: 2
Views: 823

Hybrid problem from Advanced GMAT quant Manhattan

Data Sufficiency

http://www.beatthegmat.com/remainder-an ... 02803.html

See explanatiom by GMATGuruNY

by srcc25anu

Wed Jul 03, 2013 9:39 am
Forum: Data Sufficiency
Topic: Hybrid problem from Advanced GMAT quant Manhattan
Replies: 4
Views: 1046

Ratio

Data Sufficiency

By Allegation Method:
5% ------- 100%
-----10%-----
90:5 or 18:1

Since 18 is 20 gallons, how much is 1?
1 = 20/18 = 10/9 gallons
Ans C

by srcc25anu

Tue Jul 02, 2013 10:28 pm
Forum: Data Sufficiency
Topic: Ratio
Replies: 4
Views: 1183

In the figure, square LMNO has a side of length 2x + 1

Problem Solving

Quote: 0 = 4xÂ² - 4x - 120

This should instead be 0 = 4xÂ²+ 4x - 120
solving this gives (x+6)*(x-5)=0
or x = 5 (since x cannot be -6)

Therefore x = 5

by srcc25anu

Tue Jul 02, 2013 11:27 am
Forum: Problem Solving
Topic: In the figure, square LMNO has a side of length 2x + 1
Replies: 4
Views: 2535

number system

Problem Solving

St1: x+y=1
Case 1: x = 1, y = 0 x+y = 1 and xy = 0; Is XY < 1? Yes
Case 2: x = 0.8, y = 0.2 x+y = 1 and xy = .16; Is XY < 1? Yes
sufficient

St2: x^2 + y^2 = 1
x = 1, y = 0 x^2 + y^2 = 1 and xy = 0; Is XY < 1? Yes
x = 0.8, y = 0.6 x^2 + y^2 = 1 and xy = .48; Is XY < 1? Yes
sufficient

Hence D

by srcc25anu

Mon Jul 01, 2013 11:59 pm
Forum: Problem Solving
Topic: number system
Replies: 2
Views: 806

[DS]If a, b, and c are integers and abc â‰  0

Data Sufficiency

See image attached for detailed calculations.

Ans C

by srcc25anu

Mon Jul 01, 2013 6:57 pm
Forum: Data Sufficiency
Topic: [DS]If a, b, and c are integers and abc â‰  0
Replies: 6
Views: 3403

car mechanics sc

Sentence Correction

Confused between Increase By and Increase To
slightly inclined towards Increased By
Hence C

Please post the OA along with a question.

by srcc25anu

Sun Jun 30, 2013 6:36 pm
Forum: Sentence Correction
Topic: car mechanics sc
Replies: 5
Views: 2676

Allison and Brittany

Data Sufficiency

Lets say distance between Office (Off) and Hotel (H) is 60 kms Allison starts from Off at 5:00 reached hotel at 6:00 in 1 hr therefore Allison speed = 60 m/hr St1: WHen Allison and Brit meet, Allison has covered 2/3rd the distance. Therefore Allison has covered 40 kms From this, we cant find at what...

by srcc25anu

Sun Jun 30, 2013 5:59 pm
Forum: Data Sufficiency
Topic: Allison and Brittany
Replies: 1
Views: 1149

Tough Speed, Rate, Time DS

Data Sufficiency

Half Distance = 60 yds Jen's speed for 1st half = 4 yd/sec Jen's TIME for 1st half = 60/4 = 15 secs Jen's speed for 2nd half = 5 yd/sec Jen's TIME for 2nd half = 60/5 = 12 secs Jen's total time = 27 secs to cover 120 yds St1: in 18 secs Jen covers (15secs * 4yd/sec) + (3sec * 5 yd/sec) = 75 yds in 1...

by srcc25anu

Sun Jun 30, 2013 5:42 pm
Forum: Data Sufficiency
Topic: Tough Speed, Rate, Time DS
Replies: 2
Views: 863

Square Root

Data Sufficiency

St1: âˆšx > y
âˆš4 = 2 > 1 Is x>y - Yes
âˆš1/4 = Â½ > 1/3 Is x>y - No
Hence Insufficient

St2: x^3 > y
23 = 8 > 5 Is x>y - No
23 = 8 > 1 Is x>y - Yes
Hence Insufficient

Together: x^3 > y AND âˆšx > y (See attached table)
Hence Sufficient
Ans C

by srcc25anu

Sun Jun 30, 2013 5:17 pm
Forum: Data Sufficiency
Topic: Square Root
Replies: 3
Views: 1183

Seats unoccupied

Data Sufficiency

St1: Avg unoccupied seats per row = 3.5 We don't know the number of rows so cant determine the # of unoccupied seats Insufficient St2: More than 9 rows and fewer than 12 rows so it could have either 10 or 11 rows Insufficient Together 1 + 2: We can only have 10 rows since 10 * 3.5 = 35 unoccupied se...

by srcc25anu

Sun Jun 30, 2013 5:02 pm
Forum: Data Sufficiency
Topic: Seats unoccupied
Replies: 1
Views: 712

Inequality

Problem Solving

a > b and q > p

therefore a + q > b + p
Ans D

by srcc25anu

Fri Jun 28, 2013 9:47 pm
Forum: Problem Solving
Topic: Inequality
Replies: 9
Views: 1920

Eurozone

Critical Reasoning

Ans D

by srcc25anu

Thu Jun 27, 2013 10:58 pm
Forum: Critical Reasoning
Topic: Eurozone
Replies: 2
Views: 1051

At 15:00 there were 20 students in the computer lab.

Problem Solving

At 15:00 there are 20 students STUDENTS WHO ENTER: from 15:03 to 15:44, every 3 minutes 3 students are added. # of 3 min intervals from 15:03 to 15:44, (44-3)+1/3 = 14 No of students who will enter = 14 * 3 = 42 STUDENTS WHO LEAVE: from 15:10 to 15:44, every 10 minutes 8 students leave the room. # o...

by srcc25anu

Thu Jun 27, 2013 7:19 pm
Forum: Problem Solving
Topic: At 15:00 there were 20 students in the computer lab.
Replies: 2
Views: 1795

Unlike X, Y question

Sentence Correction

In D, it seems to suggest that tough leaves require a lengthy cooking time. That's incorrect. The original meaning is intended to suggest that winter greens have a lengthy cooking time which is rightly suggested by option B.

So B is correct.

by srcc25anu

Thu Jun 27, 2013 11:13 am
Forum: Sentence Correction
Topic: Unlike X, Y question
Replies: 8
Views: 4269