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gmatophobia
PS Question 1 - June 12 A couple decides to have 4 children. If they succeed in having 4 children and each child is equally likely to be a boy or a girl, what is the probability that they will have exactly 2 girls and 2 boys? (A) 3/8 (B) 1/4 (C) 3/16 (D) 1/8 (E) 1/16 Source: Official Guide | Difficulty: Hard
(4! /(2! 2!)) /(2^4) = 3/8
Option A

gmatophobia
PS Question 1 - June 12 A couple decides to have 4 children. If they succeed in having 4 children and each child is equally likely to be a boy or a girl, what is the probability that they will have exactly 2 girls and 2 boys? (A) 3/8 (B) 1/4 (C) 3/16 (D) 1/8 (E) 1/16 Source: Official Guide | Difficulty: Hard
Those who are having difficulty in understanding the above question -this question is analogous to "A fair coin is tossed 4 times, What is the probability of getting exactly 2 Heads ?"
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B) 1/4

sorry its A) 3/8
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PS Question 2 - June 12

Ms. Barton has four children. You are told correctly that she has at least two girls but you are not told which two of her four children are those girls. What is the probability that she also has two boys? (Assume that the probability of having a boy is the same as the probability of having a girl.)

(A) 1/4
(B) 3/8
(C) 5/11
(D) 1/2
(E) 6/11

Source: Manhattan | Difficulty: Hard

** Extension to PS Question 1 - June 12
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At Branchwood Middle School, there are 4 sixth graders for every 5 seventh graders and 6 seventh graders for every 5 eighth graders. How many sixth graders are there?

1. The ratio of sixth graders to eighth graders is 24:25

2. There are 75 eighth graders at the middle school.
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deenapujari
At Branchwood Middle School, there are 4 sixth graders for every 5 seventh graders and 6 seventh graders for every 5 eighth graders. How many sixth graders are there? 1. The ratio of sixth graders to eighth graders is 24:25 2. There are 75 eighth graders at the middle school.
B

Statement 1 is merely a repeat of the information share in the premise. Hence Not sufficient.

Statement 2

From the premise we can infer that

Ratio of 6th graders : 7th graders : 8th graders :: 24:30:25

25x = 75
x = 3

24x = 72
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Join 24-Hour GMAT Quiz on YouTube - Solve Challenging GMAT Questions with Peers in Timed Conditions redirect.php?id=nrv6ixql2g
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How to get better at log?
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If a is a decimal, what is the unit digit of 10a?

(A) When a is rounded to the unit’s place, the result is 3.

(B) When a is rounded to the tenths place, the result is 3.5
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If a is a decimal, what is the unit digit of 10a? (A) When a is rounded to the unit’s place, the result is 3. (B) When a is rounded to the tenths place, the result is 3.5
C?

Hey all! Can we expect logarithm questions for the test?
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No, its out of scope
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Adithi_101
If a is a decimal, what is the unit digit of 10a? (A) When a is rounded to the unit’s place, the result is 3. (B) When a is rounded to the tenths place, the result is 3.5
A) a=c.xyz
If rounding gives us the result 3.
There are two possible cases:
c=2, and x>=5
OR
c=3, x<4
Consider the first case: if a=2.7, then 10a has the unitis digit 7
If instead, it were a=3.4 the digit is 4. Clearly insf.

2)
This tells us: a=3.xyz
Rounding up from the tenths digit. we get 3.5.
This means that either, x=4 and y>=5, or x=5 and y<5.
Two cases again. so insf.

3)
Putting the two together, there is only one possible the case. It must be that x=4, as rounding up from the units digit gives us 3, which means that we rounded down. 10a is therefore 34.yx, with units figit of 4.

Sufficient.
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DS Question 1 - June 12 If a, b, and c are positive distinct integers, is (a/b)/c an integer? (1) c = 2 (2) a = b+c Source: GMAT Club Tests | Difficulty: Hard

gmatophobia
PS Question 1 - June 12 A couple decides to have 4 children. If they succeed in having 4 children and each child is equally likely to be a boy or a girl, what is the probability that they will have exactly 2 girls and 2 boys? (A) 3/8 (B) 1/4 (C) 3/16 (D) 1/8 (E) 1/16 Source: Official Guide | Difficulty: Hard

gmatophobia
PS Question 2 - June 12 Ms. Barton has four children. You are told correctly that she has at least two girls but you are not told which two of her four children are those girls. What is the probability that she also has two boys? (Assume that the probability of having a boy is the same as the probability of having a girl.) (A) 1/4 (B) 3/8 (C) 5/11 (D) 1/2 (E) 6/11 Source: Manhattan | Difficulty: Hard ** Extension to PS Question 1 - June 12

DS Question 1 - June 14

If [x] denotes the greatest integer less than or equal to x for any number x, is [a]+=1?

(1) ab=2

(2) 0 < a < b < 2

Source: GMAT Club Tests | Difficulty: Hard

[b]PS Question 1 - June 14


A cyclist travels the length of a bike path that is 225 miles long, rounded to the nearest mile. If the trip took him 5 hrs, rounded to the nearest hour, then his average speed must be between:

A. 38 and 50 mph
B. 40 and 50 mph
C. 40 and 51 mph
D. 41 and 50 mph
E. 41 and 51 mph

Source: Manhattan | Difficulty: Hard
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gmatophobia
DS Question 1 - June 14 If [x] denotes the greatest integer less than or equal to x for any number x, is [a]+=1? (1) ab=2 (2) 0 < a < b < 2 Source: GMAT Club Tests | Difficulty: Hard
C

1. A and B can be any numbers. A can be 100 and B can be 0.02 so won’t solve alone

2. A and B both can be 0.5 or both can be 1.5 so won’t solve alone.

Take Both 1 and 2 together - Both numbers have to be 1<a,b<2 so that the product is 2.

gmatophobia
[b]PS Question 1 - June 14 A cyclist travels the length of a bike path that is 225 miles long, rounded to the nearest mile. If the trip took him 5 hrs, rounded to the nearest hour, then his average speed must be between: A. 38 and 50 mph B. 40 and 50 mph C. 40 and 51 mph D. 41 and 50 mph E. 41 and 51 mph Source: Manhattan | Difficulty: Hard
D
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gmatophobia
PS Question 1 - June 14 A cyclist travels the length of a bike path that is 225 miles long, rounded to the nearest mile. If the trip took him 5 hrs, rounded to the nearest hour, then his average speed must be between: A. 38 and 50 mph B. 40 and 50 mph C. 40 and 51 mph D. 41 and 50 mph E. 41 and 51 mph Source: Manhattan | Difficulty: Hard
Solution?

gmatophobia
DS Question 1 - June 14 If [x] denotes the greatest integer less than or equal to x for any number x, is [a]+[b]=1? (1) ab=2 (2) 0 < a < b < 2 Source: GMAT Club Tests | Difficulty: Hard
C

Adithi_101
If a is a decimal, what is the unit digit of 10a? (A) When a is rounded to the unit’s place, the result is 3. (B) When a is rounded to the tenths place, the result is 3.5
E

sg_mba
E
Sorry C
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A piece of carpet in the shape of a trapezoid has a smaller base measuring 50 inches and the larger base measuring 70 inches. What is the perimeter of the carpet?

(1) The area of the carpet is 450 square inches.
(2) The height of the carpet is 7.5 inches.

Can some one explain this? Why can’t one side be equal to the Height and the other side we can find with the help of Pythagoras Theorem. So, D should be sufficient. 50+70+s1+s2
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answer is strangely E
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