Quant Question of the Day Chat

Shwetaroy, wickedvikram, - In the DS question, the numbers can be fraction.

DS Question 1 - May 04

Is x > y^2 ?

(1) x > y + 5
(2) x^2 - y^2 = 0

Source: GMAT Club Tests | Difficulty: Hard

PS Question 1 - May 04

For any integer P greater than 1, P! denotes the product of all integers from 1 to P, inclusive. A number is chosen at random from the list of factors of 8!. What is the probability that the chosen number is a multiple of 28?

(A) 0
(B) 1/16
(C) 3/8
(D) 7/16
(E) 7/8

Source: eGMAT | Difficulty: Hard

DS Question 2 - May 04

If |a – b| = 6 and |b – c| = 15, then what is the value of |c|?

(1) |a – c| = 9
(2) |b| = 9

Source: EMPOWERgmat | Difficulty: Hard

yes, missed that completely

C; Thanks for testing fractions again

C

E

What is the difference between a two-digit number and the number obtained by interchanging the digits of the original number, if the difference between the original number and the number obtained by reversing the digits is 27?

isn’t the answer given in the question itself ? 27

DS Question 1 - May 06

If p and q are positive integers such that p = 4q – 3, what is the greatest common divisor of p and q?

(1) q = 3k, where k is an integer

(2) p = 3m, where m is an integer

Source: GMAT Whiz | Difficulty: Hard

PS Question 1 - May 06

In a 1000-mile, race Flash gives Superman a head start of 40 miles and beats him by 19 milliseconds. If, in a 1000-mile race, Flash gives Superman a head start of 30 milliseconds then Superman beats Flash by 40 miles. What is the ratio of speed of Flash to that of Superman ?

A. 4:5
B. 5:6
C. 6:5
D. 5:4
E. 4:3

Source: GMAT Club Tests | Difficulty: Hard

ds 1 D

PS 1 E

C?

HOW can we know answers

Hello ! The answers are generally posted the next day so that everyone gets a fair chance to solve and post what they think. However, if you would like to know the answers early, you can search the question and review the answer / discussion on the relevant question thread.

sorry how can i find the groups?

DS Question 1 - May 08

Is x is an integer ?

(1) x²/2 is an integer.

(2) √x is an integer.

Source: GMAT Ninja | Difficulty: Medium

PS Question 1 - May 08

A farmer has an apple orchard consisting of Fuji and Gala apple trees. Due to high winds this year 10% of his trees cross pollinated. The number of his trees that are pure Fuji plus the cross-pollinated ones totals 187, while 3/4 of all his trees are pure Fuji. How many of his trees are pure Gala?

A. 22
B. 33
C. 55
D. 77
E. 88

Source: Manhattan | Difficulty: Medium

How is this D?

Should be B I think

YEAH! I did not considered roots. so B is correct

can you explain how did you get the number?

andrealaiglesia, You can refer to the discussion of this question here - a-farmer-has-an-apple-orchard-consisting-of-fuji-and-gala-93322.html

Please feel free to post if you need any further clarification.

DS Question 1 - May 10

If m and n are non-negative integers, what is the units digit of 5^m + 6^n?

(1) m + n > 2
(2) mn > 0

Source: GMAT Club Tests | Difficulty: Medium

PS Question 1 - May 10

Which of the following is/are true?

I. |3x - 19| > 5 - x holds for all values of x.
II. There is no value of x for which |2x - 10| < 4 - x holds.
III. -|5x - 23| is negative for all values of x.

A. None
B. I only
C. I and II only
D. I and III only
E. I, II and III

Source: Expert’s Global | Difficulty: Hard

can anybody guide me how can i cover good modulus inequalities question

This is a good question that benefits from "leveraging" answer choices.
Consider the third statement: If we have x=23/5, it becomes 0 which is non negative. This allows us to eliminate E and D instantly.

2 can be easily considered by looking at extrema: the lhs has value 0 for x=5, but rhs is still bigger. For large negative values, the lhs is clearly larger than the rhs, and for large positive rhs will always be negative, and lhs is always non negative by construction. Statement 2 must be true.

Since of all choices, only C has statement 2 withiut statement 3, it must be true

Take note that it states m and n are non negative integers. In other words, m and n can be 0,1,2....
Also note that any number with 5 in tbe units digit will always have 5, if it taised to a positive power. The same applies to 6 (always 6 if pos power).
Statement 1 is a trap. Consider the case of m=0, n=3. We would have units digit of 6. But if m=2, n=3, unjts digit of 1.
Statement 2 works. It will always be 1 units digit since it will be 5+6 in the units place.
B.