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During a certain week, a seal ate 50 percent of the first 80

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Carcass

Verbal Expert

Joined: 18 Apr 2015

Posts: 21019

During a certain week, a seal ate 50 percent of the first 80 [#permalink]

11 Jul 2018, 09:47

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Question Stats:

66% (02:17) correct

33% (01:25) wrong

based on 6 sessions

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During a certain week, a seal ate 50 percent of the first 80 smelt it came across, and 30 percent of the remaining smelt it came across. If the seal ate 40 percent of the smelt it came across during the entire week, how many smelt did it eat?

A. 24

B. 32

C. 55

D. 64

E. 80

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msk0657

Active Member

Joined: 29 May 2018

Posts: 126

Re: During a certain week, a seal ate 50 percent of the first 80 [#permalink]

13 Jul 2018, 05:41

Carcass..solution plz..

pranab223

Retired Moderator

Joined: 20 Apr 2016

Posts: 1307

WE:Engineering (Energy and Utilities)

Re: During a certain week, a seal ate 50 percent of the first 80 [#permalink]

13 Jul 2018, 06:02

Carcass wrote:

Let x = total number of smelt a seal came across

So as per statement we can write:

\((0.5 * 80) + 0.3(x - 80) = 0.4x\)

or \(0.1 x = 16\)

or \(x =160\)

Therefore the seal eat 40% of smelt it came across = \(0.4 * 160 = 64\)
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