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Intern
Joined: 06 Mar 2016
Posts: 15

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27 Aug 2018, 16:03
00:00

Difficulty:

45% (medium)

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
Joined: 20 Feb 2015
Posts: 790
Concentration: Strategy, General Management

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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
Joined: 07 Jul 2012
Posts: 372
Location: India
Concentration: Finance, Accounting
GPA: 3.5

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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

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Senior Manager
Joined: 07 Oct 2017
Posts: 258

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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
Attachment:

1535452258871.jpg [ 53.11 KiB | Viewed 248 times ]

Thank you = Kudos
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Thank you =Kudos
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Re: Percentage   [#permalink] 28 Aug 2018, 03:29
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