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Percentage

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Intern
Intern
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B
Joined: 06 Mar 2016
Posts: 15
Percentage  [#permalink]

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New post 27 Aug 2018, 16:03
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

44% (00:22) correct 56% (00:47) wrong based on 9 sessions

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In an experiment, a solution ‘P’ was observed. 1st hour ,8% of solution ‘P’ evaporated. In 2nd hour, 5% of remaining solution evaporated. What percent of initial solution is left after 2 hours?

Ans-
A-80
B-85.4
C-67
D-87.4%

Can someone please help me explain the question when it talks about the “5% of remaining solution evaporated”.

Posted from my mobile device
Director
Director
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G
Joined: 20 Feb 2015
Posts: 744
Concentration: Strategy, General Management
Premium Member CAT Tests
Percentage  [#permalink]

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New post 28 Aug 2018, 00:40
divyajoshi12 wrote:
In an experiment, a solution ‘P’ was observed. 1st hour ,8% of solution ‘P’ evaporated. In 2nd hour, 5% of remaining solution evaporated. What percent of initial solution is left after 2 hours?

Ans-
A-80
B-85.4
C-67
D-87.4%

Can someone please help me explain the question when it talks about the “5% of remaining solution evaporated”.

Posted from my mobile device


step-1

1st hour we subtract 8% from p
we are left with p-0.08p=.92p = 92% of the solution

step 2
5% of the remaining means 5% of 92% soluton
which is 4.6%

remaining 92-4.6 = 87.4%
Senior Manager
Senior Manager
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P
Joined: 07 Jul 2012
Posts: 370
Location: India
Concentration: Finance, Accounting
GPA: 3.5
Premium Member
Re: Percentage  [#permalink]

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New post 28 Aug 2018, 01:44
Let Quantity of Initial Solution P =100

During 1st hour= 100*\(\frac{8}{100}\)= 8

Remaining= 100-8= 92

During 2nd hour= 92*\(\frac{5}{100}\)= 4.6

Remaining= 92-4.6= 87.4

Answer: D.
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Senior Manager
Senior Manager
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Joined: 07 Oct 2017
Posts: 273
Re: Percentage  [#permalink]

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New post 28 Aug 2018, 03:29
1
divyajoshi12 wrote:
In an experiment, a solution ‘P’ was observed. 1st hour ,8% of solution ‘P’ evaporated. In 2nd hour, 5% of remaining solution evaporated. What percent of initial solution is left after 2 hours?

Ans-
A-80
B-85.4
C-67
D-87.4%

Can someone please help me explain the question when it talks about the “5% of remaining solution evaporated”.

Posted from my mobile device
Answer is E
Attachment:
1535452258871.jpg
1535452258871.jpg [ 53.11 KiB | Viewed 67 times ]


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GMAT Club Bot
Re: Percentage &nbs [#permalink] 28 Aug 2018, 03:29
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