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# A radioactive chemical decays 20 percent each day. If 48 pounds of thi

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Math Expert
Joined: 02 Sep 2009
Posts: 55801
A radioactive chemical decays 20 percent each day. If 48 pounds of thi  [#permalink]

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11 Jan 2019, 00:37
1
1
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Difficulty:

15% (low)

Question Stats:

88% (01:06) correct 13% (02:14) wrong based on 18 sessions

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A radioactive chemical decays 20 percent each day. If 48 pounds of this chemical remain today, how many pounds of this chemical were present two days ago?

A. 75
B. 72
C. 70
D. 66
E. 60

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Re: A radioactive chemical decays 20 percent each day. If 48 pounds of thi  [#permalink]

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11 Jan 2019, 03:01
Bunuel wrote:
A radioactive chemical decays 20 percent each day. If 48 pounds of this chemical remain today, how many pounds of this chemical were present two days ago?

A. 75
B. 72
C. 70
D. 66
E. 60

it can be written as
48=x*0.8 * 0.8
x = 75 IMO A
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Re: A radioactive chemical decays 20 percent each day. If 48 pounds of thi   [#permalink] 11 Jan 2019, 03:01
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# A radioactive chemical decays 20 percent each day. If 48 pounds of thi

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