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Simple Algebra

Hey all - this is a simple question from a Kaplan workbook. If (q)(34)(36)(38) = (17)(18)(19) then q =? Am I missing something... this is a pretty easy question, but I am getting the wrong answer. Here is my method (where is my logic askew?) (q)(34)(36)(38) = (17)(18)(19) Factor out the two on the L...

by franciskyle

Sat Mar 28, 2009 5:07 pm
Forum: Problem Solving
Topic: Simple Algebra
Replies: 3
Views: 1307

I arrived at a different answer for the triangle question. I looked at it the following way... is there a mistake in my logic?

eqn 1: S = (B*H)/2

and

eqn 2: 2s = (B*H)/2

Therefore

Rearrange eqn 2: 2s = (B*H)/2 --> B*H = 4s

Plug eqn 2 into eqn 1

S = (4s)/2

Therefore

S = 2s

by franciskyle

Sat Mar 14, 2009 6:34 pm
Forum: Problem Solving
Topic: GMAT Prep - triangle and aveage problem
Replies: 4
Views: 2384

You could immediately draw the below equation from the problem - X being the fourth test score.

(3*85 + X)/4 = 87

Therefore X = 93

by franciskyle

Sat Mar 14, 2009 6:22 pm
Forum: Problem Solving
Topic: Average
Replies: 5
Views: 1474
by franciskyle

Fri Mar 13, 2009 11:35 pm
Forum: GMAT Essays (AWA)
Topic: Essay Score
Replies: 1
Views: 1639

Ps: The answer is E, because the two sides of the equation are equal.

by franciskyle

Fri Mar 13, 2009 12:42 am
Forum: Problem Solving
Topic: Function
Replies: 9
Views: 1932

I have seen this question before, and I think that D should actually be 2/3 not 2x. That would make it possible to solve. All you need to do for this one is plug A+B, A & B into each respective equation to see if they equate. A: (A+B)^2 NOT= A^2 + B^2 B: (A + B) + 1 NOT= (A+1) + (A+1) C: sqrt(A+...

by franciskyle

Fri Mar 13, 2009 12:41 am
Forum: Problem Solving
Topic: Function
Replies: 9
Views: 1932

That's kind of what I thought.

by franciskyle

Thu Mar 12, 2009 9:14 pm
Forum: Problem Solving
Topic: Series
Replies: 10
Views: 2688

2x + 24y = 124 Rearrange: 24y = (124 - 2x) Now quickly go through the solutions (y must equal an integer). A: 24y = 26, therefore no good B: 24y = 54, therefore no good C: 24y = 48, therefore this is a solution, since y = 2 D: 24y = 68, therefore no good E: 24y = 72, therefore this is ALSO a solutio...

by franciskyle

Thu Mar 12, 2009 9:06 pm
Forum: Problem Solving
Topic: Series
Replies: 10
Views: 2688

Pattern = 6 Digits long

44 / 6 = 7 R 2

Therefore the hundredths digit (because remainder 2) should be the same as the 44th digit.

9

by franciskyle

Thu Mar 12, 2009 8:47 pm
Forum: Problem Solving
Topic: Repeating decimal
Replies: 3
Views: 2191

krisraam wrote:41,40,9 forms a right triangle.

So the diameter is 41.
Is the hypotenuse of an inscribed (circle) right triangle always the diameter?

by franciskyle

Thu Mar 12, 2009 8:40 pm
Forum: Problem Solving
Topic: Geometry, Circumscribe
Replies: 4
Views: 1618

Hi cramya... I find the way you solved this problem interesting. The easy way to do it would be to break down 130 in to its prime factors first 130 =2*5*13 = 2^1*5^1*13^1 Now to find the number of factors add 1 to the exponent of each prime factor and multiply (1+1) (1+1) (1+1) = 8 unique factors Ar...

by franciskyle

Thu Mar 12, 2009 7:22 pm
Forum: Problem Solving
Topic: Arithmetic
Replies: 6
Views: 1886

Thanks... that is my Achilles heel - jumping the gun and making stupid mistakes.

by franciskyle

Thu Mar 12, 2009 3:03 pm
Forum: Problem Solving
Topic: Divisibility & Prime Number
Replies: 5
Views: 1407

To do this quicker, you could have looked at the numerator. Since it ends in 0, you automatically know that it is divisible by 1,2,5,10. That gives us 4 factors, which need each some other unique factor to multiply with to get 130 - therefore you immediately know that there are AT LEAST 8 factors. S...

by franciskyle

Thu Mar 12, 2009 2:52 pm
Forum: Problem Solving
Topic: Arithmetic
Replies: 6
Views: 1886

n < 0 & n^2 < 1/100... n < - 1/10

Multiplying both sides by -10 while dividing by n

-10 > 1/n

Therefore A

by franciskyle

Thu Mar 12, 2009 2:02 am
Forum: Problem Solving
Topic: Reciprocal
Replies: 3
Views: 1376

The absolute value for the ratios is the same, but the ratios themselves are not.

Put it into English to better understand:

A:

I have two for every one that you do not have

B:

I have two for every one that you have

by franciskyle

Thu Mar 12, 2009 1:52 am
Forum: Problem Solving
Topic: Can RATIO be negative?
Replies: 4
Views: 26360