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Re: Quant Question of the Day Chat [#permalink]
Got it. Any shorter way to it. I knew the longer way.
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Re: Quant Question of the Day Chat [#permalink]
harshitasinha16 wrote:
Got it. Any shorter way to it. I knew the longer way.

You can copy paste the question into search and check the forum. There might be someone proposing a shorter way than this one.
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Re: Quant Question of the Day Chat [#permalink]
Easy way to solve a tsd question is to visualize it.
V----S ; Straight line.
Ratio2:1.
D1=D2
Gives 3 part D.
Divide the line in 3 part.
V-D-D-D-S
2 D covered by V @ 10 min
D = 5
10+5 = 15 min for V
D for S is 10 min, therefore, S will take a total of 30 min.
Satisfies the ratio of 2:1.

Visualizing helps reduce the memorization of unnecessary formulas
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Re: Quant Question of the Day Chat [#permalink]
gmatophobia wrote:
DS Question 1 - Sep 10 A drawer contains 8 socks, and 2 socks are selected at random without replacement. What is the probability that both socks are black? (1) The probability is less than 0.2 that the first sock is black. (2) The probability is more than 0.8 that the first sock is white. Source: Magoosh | Difficulty: Hard

1) If p(black)<0.2
then
x/8<2/10
10x<16
x<1.6
x is either 1 or 0. Either way, there is no possibility of getting two black socks. Suff.

2) if p(white)>0.8
then
x/8>8/10
10x>64
x>6.4
The quantity of white socks is 7 or 8.
If we assume the best case scenario, in which there are only white and black socks (this is not given, but we can assume it) then the highest number of black socks possible is 1, making it impossible for there to be 2 black socks selected.
Sufficient.

D
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Re: Quant Question of the Day Chat [#permalink]
Can anyone help me with score relation between GMAT Club Tests and Actual GMAT exam for quant.
How accurate is it?
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Re: Quant Question of the Day Chat [#permalink]
Q, If a and b are positive, is a^ b/2 > a^b?
(1) 1 < b < b^a
(2) a < b

I understand that from the Q we get that a^b > 1 But then we say, So a>1 ???!!! why ? why a>1 ?

Sorry i made a mistake in the pre question this is right:
Q, If a and b are positive, is a^ b/2 > a^b?
(1) 1 < b < b^a
(2) a < b

I understand that from the Q we get that a^b < 1 But then we say, So a<1 ???!!! why ? why a<1 ?
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Re: Quant Question of the Day Chat [#permalink]
Bunny96 wrote:
Sorry i made a mistake in the pre question this is right: Q, If a and b are positive, is a^ b/2 > a^b? (1) 1 < b < b^a (2) a < b I understand that from the Q we get that a^b < 1 But then we say, So a<1 ???!!! why ? why a<1 ?

two pos exponents will only have a value less than 1 if the base is some fraction.

So if a^b<1, a must be less than one given that a and b are both positive

If you take a min value of a, say 1 and raise it to a power b, the limit of 1^b as b approaches 0 is 1, so 1^b will be will always be more than one
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Re: Quant Question of the Day Chat [#permalink]
is the answer A ?

Is ans A ?
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Re: Quant Question of the Day Chat [#permalink]
gmatophobia wrote:
PS Question 1 - Sep 10 If grapes are 92% water and raisins are 20% water, then how much did a quantity of raisins, which currently weighs 10 pounds, weigh when all the raisins were grapes? (Assume that the only difference between their raisin-weight and their grape-weight is water that evaporated during their transformation.) A. 25 pounds B. 46 pounds C. 92 pounds D. 100 pounds E. 146 pounds Source: Veritas Prep | Difficulty: Hard

can someone help me with this question please
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Re: Quant Question of the Day Chat [#permalink]
gmatophobia wrote:
PS Question 1 - Sep 10 If grapes are 92% water and raisins are 20% water, then how much did a quantity of raisins, which currently weighs 10 pounds, weigh when all the raisins were grapes? (Assume that the only difference between their raisin-weight and their grape-weight is water that evaporated during their transformation.) A. 25 pounds B. 46 pounds C. 92 pounds D. 100 pounds E. 146 pounds Source: Veritas Prep | Difficulty: Hard

Answer is B
Because if raisins water is 20% and it’s weight is 10 pounds so the there is half weight of water and half raisins in 20% of it so when raisins are in grape form it’s 92% that means half of its weight is 46 so the answer is B.
If I’m wrong then explain how so that I can point out my weak point
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Re: Quant Question of the Day Chat [#permalink]
1
Kudos
Dude the weight loss is only the water that evaporated, grape content that turned to raisins remains constant.
In a shell, that is grape, that content when from 8 to 8, I.e., 10x.
So 0.08x = 0.8x10 = 100.

8 to 80*
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Re: Quant Question of the Day Chat [#permalink]
I think answer is 100

Posted from my mobile device
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Re: Quant Question of the Day Chat [#permalink]
Priyanshu2807 wrote:
Dude the weight loss is only the water that evaporated, grape content that turned to raisins remains constant. In a shell, that is grape, that content when from 8 to 8, I.e., 10x. So 0.08x = 0.8x10 = 100.

Thank you so much pal✨
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Re: Quant Question of the Day Chat [#permalink]
One third, one fourth, one fifth and one-seventh of the human population of Island X, which has fewer than 5000 human inhabitants, are all whole numbers and their sum is exactly the population of Island Y. What is the population of Island Y?

A.4200 B.4279 C.4581 D. None of these

Can anyone solve this math in details?
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Re: Quant Question of the Day Chat [#permalink]
What’s the answer to this?
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Re: Quant Question of the Day Chat [#permalink]
I think A

I calculated population of island X not Y. sorry
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Re: Quant Question of the Day Chat [#permalink]
Haha yes, when we add then it’s D

Actually no it’s B
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