Search found 338 matches


Re: Which of the following best approximates the value of q if \(5^{28}+3^{11}=5^q?\)

3^3 =27 and 5^2 = 25 Problem asks for approximate answer, so the above are approximately equal. So using the above 3^9 = 5^6, so 3^11 is about equal to 9*5^6 5^28 + 9*5^6 = 5^q Divide by 5^6 5^22 +9 = 5^(q-6) In the context of these large numbers, 9 is effectively 0, so 5^22 =5^(q-6) So q = 28, C


Re: If \(P^2-QR=10,\) \(Q^2+PR=10,\) \(R^2+PQ=10,\) and \(R\ne Q,\) what is the value of \(P^2+Q^2+R^2?\)

You're free to choose values for P,Q,and R that satisfy the equalities with the exception of R $$\ne$$ Q.

So, let P=Q

P^2 -PR = 10
P^2 + PR =10

from the first two equalities, therefore
P^2 = 10

this means that R must =0

Since P=Q, Q^2 also =10

So P^2+Q^2+R^2 =20,C


Re: In the figure above, \(X\) and \(Y\) represent locations in a district of a certain city where the streets form a re

To get from X to Y 5 steps to the right and 3 steps up need to be taken and there are many paths. The problem is simplified in that no steps to the left or down are permitted. One can therefore see that the 5 steps to the right can be shown as RRRRR and the 3 up as UUU. As a group these 8 steps can ...


Algebra

Now in (1) we are given value of T so the equation becomes 0.15X+ 0.29Y = 4.40. We still have 1 equation and 2 variable 1 and 2. So we cannot solve for either of the variables X and Y. This is clearly NOT Sufficient. Just because the equation cannot be solved by the process of elimination of variab...

by regor60

Wed Dec 18, 2019 8:07 am
Forum: GMAT Math
Topic: Algebra
Replies: 8
Views: 7377

Source: Manhattan Prep If the number 200! is written in the form \(p \times 10^q\), where \(p\) and \(q\) are integers, what is the maximum possible value of \(q\)? A. 40 B. 48 C. 49 D. 55 E. 64 The OA is C We have to get the value of \(q\) where \(q\) is the exponent of \(10^q\). Thus, we have to ...

by regor60

Thu Aug 01, 2019 6:22 am
Forum: Problem Solving
Topic: If the number 200! is written in the form \(p \times 10^q\),
Replies: 4
Views: 439

Source: Manhattan Prep If the number 200! is written in the form \(p \times 10^q\), where \(p\) and \(q\) are integers, what is the maximum possible value of \(q\)? A. 40 B. 48 C. 49 D. 55 E. 64 The OA is C We have to get the value of \(q\) where \(q\) is the exponent of \(10^q\). Thus, we have to ...

by regor60

Thu Aug 01, 2019 6:19 am
Forum: Problem Solving
Topic: If the number 200! is written in the form \(p \times 10^q\),
Replies: 4
Views: 439

Source: Manhattan Prep A certain bag of gemstones is composed of two-thirds diamonds and one-third rubies. If the probability of randomly selecting two diamonds from the bag, without replacement, is \(\frac{5}{12}\), what is the probability of selecting two rubies from the bag, without replacement?...

by regor60

Mon Jul 22, 2019 7:46 am
Forum: Problem Solving
Topic: A certain bag of gemstones is composed of two-thirds
Replies: 5
Views: 578

5 boys and 5 girls randomly select seats around a circular table that seats 10. What is the probability that two girls will sit next to one another? A.11/24 B.23/24 C.23/48 D.47/48 E.125/126 OA: E The answer works only if the question is interpreted to mean "two or more". Therefore, to not have any...

by regor60

Tue Jun 25, 2019 5:57 am
Forum: Problem Solving
Topic: 5 boys and 5 girls randomly select
Replies: 2
Views: 406

Call the numbers X and Y. So X+Y=1 and XY=-1 given the problem statement. Let's square X+Y = X^2+2XY+Y^2 = 1. Since XY=-1, we can substitute: X^2+Y^2-2 = 1. So, X^2+Y^2 = 3. Multiplying X^2+Y^2 by X+Y = (X+Y)(X^2+Y^2) = X^3 + Y^3 +XY^2 + YX^2 = (3)(1) Factor an XY from the last two terms: X^3+Y^3 + ...

by regor60

Wed May 08, 2019 7:31 am
Forum: Problem Solving
Topic: The sum of two numbers is 1 and their product is -1. What is
Replies: 4
Views: 456

In Smithtown, the ratio of right-handed people to left-handed people is 3 to 1 and the ratio of men to women is 3 to 2. If the number of right-handed men is maximized, then what percent of all the people in Smithtown are left-handed women? (A) 50% (B) 40% (C) 25% (D) 20% (E) 10% [spoiler]OA=C[/spoi...

by regor60

Mon Apr 22, 2019 10:00 am
Forum: Problem Solving
Topic: In Smithtown, the ratio of right-handed people to
Replies: 2
Views: 363

A woman has seven cookies - four chocolate chip and three oatmeal. She gives one cookie to each of her six children: Nicole, Ronit, Kim, Deborah, Mark, and Terrance. If Deborah will only eat the kind of cookie that Kim eats, in how many different ways can the cookies be distributed? (A) 5040 (B) 50...

by regor60

Mon Apr 22, 2019 9:49 am
Forum: Problem Solving
Topic: A woman has seven cookies - four chocolate chip and three
Replies: 2
Views: 453

=> The maximum number of draws we can make without drawing 5 balls of a single color is 3 + 4 + 4 + 4 + 4 = 14. This occurs when we draw 3 red balls, 4 green balls, 4 yellow balls, 4 blue balls and 4 white balls. If we draw one more ball, then we will have drawn 5 balls of a single color. Thus, to ...

by regor60

Wed Mar 20, 2019 6:34 am
Forum: Problem Solving
Topic: A box contains 3 red balls, 4 green balls, 5 yellow balls, 6
Replies: 4
Views: 1579

GMATH practice exercise (Quant Class 16) The product of the positive 4-digit integer 118A and 25847 is 4758 units less than a number that leaves remainder 1 when divided by 5. How many values are possible for the digit A? (A) None (B) Only 1 (C) Only 2 (D) Only 3 (E) More than 3 Answer: [spoiler]__...

by regor60

Thu Feb 07, 2019 12:00 pm
Forum: Problem Solving
Topic: The product of the positive 4-digit integer 118A and 25847
Replies: 2
Views: 334

Hi regor60, I agree that this prompt is poorly-worded. The "intent" is to ask for every 4-letter arrangement that fits the given restrictions, INCLUDING "words" that do not appear in the dictionary (re: arrangements that are not actually words). GMAT question-writers are far more specific with how ...

by regor60

Tue Feb 05, 2019 10:57 am
Forum: Problem Solving
Topic: In how many ways can a 4-letter word be formed from the
Replies: 6
Views: 618