## Search found 243 matches

#### Triangle Practices

###### Problem Solving

My bad, there's a typo in my post. 2 - 1/2 = 3/2! I corrected my previous post.

by MAAJ

Tue May 17, 2011 5:02 am
Forum: Problem Solving
Topic: Triangle Practices
Replies: 3
Views: 829

#### Triangle Practices

###### Problem Solving

yÂ² = 2 -> y = sqrt(2)

aÂ² + bÂ² = cÂ²
(sqrt(2)/2)Â² + bÂ² = sqrt(2)Â²
(2/4) + bÂ² = 2
(1/2) + bÂ² = 2
bÂ² = 2 - (1/2)
bÂ² = 3/2
b = sqrt(3)/sqrt(2)

Area = a * b * 1/2
(sqrt(2)/2) * sqrt(3)/sqrt(2) * 1/2
sqrt(3)/4

by MAAJ

Mon May 16, 2011 6:24 pm
Forum: Problem Solving
Topic: Triangle Practices
Replies: 3
Views: 829

#### GMAC paper test WT practice

###### Problem Solving

Awww... took me a lot of time but got it at last... it's [spoiler](A)[/spoiler]

sqrt(x)/2 = 2x
sqrt(x) = 4x
x = 16xÂ²
16xÂ² - x + 0 = 0 -> zÂ² = 16xÂ² -> z = 4x -> x = z/4
zÂ² - (1/4)z + 0 = 0
(z - 1/4)(z + 0) = 0
z = 1/4 OR z = 0

zÂ² = (1/4)Â² = 16xÂ²
1/16 = 16xÂ²
1/16Â² = xÂ²
1/16 = x

by MAAJ

Mon May 16, 2011 3:42 pm
Forum: Problem Solving
Topic: GMAC paper test WT practice
Replies: 3
Views: 880

#### Good Number Properties Problem from GMAC paper test

###### Problem Solving

Prime Factors 3 -> 3 4 -> 2,2 7 -> 7 LCM = 2x2x3x7 = 84 3x/84 = 4y/84 = 7z/84 x/28 = y/21 = z/12 If we make x, y and z equal to 1: x = 28; y = 21; z = 12 and (x + y + z) = 28 + 21 + 12 = 61 That's how I got [spoiler] D? [/spoiler] Can someone walk me through this one. thanks If x, y, and z are posit...

by MAAJ

Mon May 16, 2011 3:23 pm
Forum: Problem Solving
Topic: Good Number Properties Problem from GMAC paper test
Replies: 2
Views: 1006

#### Ratios from GMAC paper test

###### Problem Solving

Yup IMO (B) too

(1/5x)/(1/6y)?

5x = 6y
x/y = 6/5

(1/5)6/(1/6)5
(6/5)/(5/6)
36/25

by MAAJ

Mon May 16, 2011 3:03 pm
Forum: Problem Solving
Topic: Ratios from GMAC paper test
Replies: 2
Views: 772

#### 24/sqr3

###### Problem Solving

PS: I sent you a PM!!! We can simplify expresions like this if we multiply the numerator and denominator by the same root (in this case sqrt(3)). The value won't be changed because its the same as multiplying by 1. It's just to change the "format" of the fraction to make it simplier to read. [24/sqr...

by MAAJ

Mon May 16, 2011 5:58 am
Forum: Problem Solving
Topic: 24/sqr3
Replies: 3
Views: 864

#### is ×€x×€ less than I?

###### Data Sufficiency

Edit: NVM found -1 < x < 0 is valid for statement 1 Guys I'm getting (A)... what am I missing? If x is not equal to 0, is |x| < 1? (1) x/|x| < x Multiplying by |x| on both sides won't change sign and we get x < x|x| For this to be possibe x > 1, thus x = GT(1) |GT(1)| < 1 ? Answer is no. Sufficient ...

by MAAJ

Sat May 14, 2011 10:34 am
Forum: Data Sufficiency
Topic: is ×€x×€ less than I?
Replies: 4
Views: 905

#### a data from gmatclub

###### Data Sufficiency

15. If (s^4)(vÂ³)(x^7) < 0, is svx < 0? One of s,v,x is negative an the others positive? Are s,v,x all positive? (s^4)(vÂ³)(x^7) < 0 (s^4)(vÂ³)(x^7) < 0 (+) (?) (?) < 0 From this we know that s could be positive or negative and the result will always be positive, and that one of the other parenthesi...

by MAAJ

Sat May 14, 2011 7:30 am
Forum: Data Sufficiency
Topic: a data from gmatclub
Replies: 2
Views: 703

#### Remainder and 1

###### Problem Solving

Things to remember: Multiple of N +/- Multiple of N = Multiple of N -> Hence divisible by N Non-Multiple of N +/- Multiple of N = Non-multiple of N -> Hence not divisible by N **Non-Multiple of N +/- Non-Multiple of N = Could be or not a multiple of N -> Can't tell divisibility (** In this case N = ...

by MAAJ

Fri May 13, 2011 2:37 pm
Forum: Problem Solving
Topic: Remainder and 1
Replies: 2
Views: 789

#### princeton DS

###### Problem Solving

a = integer a = even a < 3 a = 2,0,-2,-4,-6,etc... By definition an even number divided by 2 yields a remainder of 0. IMO answer should be (E) If a and b are integers and a is even, what is the value of a â€“ b? (1) a < 3 (2) a/b = 2/7 oa- E quick question-> are -ve numbers odd and even ? does state...

by MAAJ

Fri May 13, 2011 9:50 am
Forum: Problem Solving
Topic: princeton DS
Replies: 4
Views: 641

#### points on a number line.

###### Data Sufficiency

Hey I arrived to (E). Just wanted to post the way I solved it. |x - y| > |x - z| ; Is x < z < y ? OR y < z < x ? Find the positive ABS: x - y > x - z -y > -z y < z STMT 1: Insufficient x y z < 0 + + - < 0 + - + < 0 - + + < 0 STMT 2: Insufficient x y < 0 + - < 0 - + < 0 Combined 1 & 2, only these two...

by MAAJ

Fri May 13, 2011 9:30 am
Forum: Data Sufficiency
Topic: points on a number line.
Replies: 43
Views: 22146

#### ratio

###### Data Sufficiency

alltimeacheiver wrote:why not b. It is clear at one sight.. pls share ur input
Can you please copy the problem? I can't see the .PNG ....

by MAAJ

Fri May 13, 2011 5:25 am
Forum: Data Sufficiency
Topic: ratio
Replies: 8
Views: 2919

#### Value of N

###### Data Sufficiency

This isn't a GMAT question. Both statements contradict each other. Either way, the answer should be E because the first statement n = 2,3,4 and in the second statement n = 11,12,13..., 23 Make sure you have written the question correctly, and if you actually did, then just skip this question. If n i...

by MAAJ

Fri May 13, 2011 5:24 am
Forum: Data Sufficiency
Topic: Value of N
Replies: 3
Views: 782

#### Does x+y=5?

###### Data Sufficiency

Here you can't use "x+y = 5?" and one of the other equations to solve because "x+y = 5?" is a question not a statement. When you have two unknowns you can determine through two quad. equations. If you use the orig with any of the two individually you can find values for the individual variables. Not...

by MAAJ

Fri May 13, 2011 5:15 am
Forum: Data Sufficiency
Topic: Does x+y=5?
Replies: 4
Views: 4850

#### inequalities

###### Problem Solving

If 4<(7-x)/3, which of the following is true?
x < -5
x = LT(-5)

I) 5 < x False

II) |x + 3| > 2
|LT(-5)+3| > 2
|LT(-2)| > 2 True, because the absolute value will be greater than 2

iii) -(x+5) > 0
-(LT(-5)+5) > 0
-(LT(0)) > 0 True, because LT(0) means some number less than 0

by MAAJ

Thu May 12, 2011 3:56 pm
Forum: Problem Solving
Topic: inequalities
Replies: 5
Views: 876