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# The number of cells killed by a virus doubles every hour. If the numbe

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Math Expert
Joined: 02 Sep 2009
Posts: 58333
The number of cells killed by a virus doubles every hour. If the numbe  [#permalink]

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05 Mar 2019, 02:43
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Difficulty:

5% (low)

Question Stats:

89% (01:20) correct 11% (01:31) wrong based on 35 sessions

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The number of cells killed by a virus doubles every hour. If the number of cells killed was initially 10^3, what is the number of cells killed after eight hours have passed?

A. 8(10^3)
B. (10^3)(10^8)
C. 2^8(10^3)
D. 2^4(10^3)
E. 2^8(10^8)

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Re: The number of cells killed by a virus doubles every hour. If the numbe  [#permalink]

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05 Mar 2019, 03:17
Bunuel wrote:
The number of cells killed by a virus doubles every hour. If the number of cells killed was initially 10^3, what is the number of cells killed after eight hours have passed?

A. 8(10^3)
B. (10^3)(10^8)
C. 2^8(10^3)
D. 2^4(10^3)
E. 2^8(10^8)

cells killed initially = $$10^3$$

Doubles every hour for 8 hrs = $$2^8$$

Total number of cells killed after 8 hrs = $$10^32^8$$

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Re: The number of cells killed by a virus doubles every hour. If the numbe  [#permalink]

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05 Mar 2019, 09:15
Bunuel wrote:
The number of cells killed by a virus doubles every hour. If the number of cells killed was initially 10^3, what is the number of cells killed after eight hours have passed?

A. 8(10^3)
B. (10^3)(10^8)
C. 2^8(10^3)
D. 2^4(10^3)
E. 2^8(10^8)

1 hr = 10^3
now doubles every hour ; it becomes 2* intial value
so for 8 hrs ; 2^8 * initial value ; 2^8 *10^3
IMO C
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Re: The number of cells killed by a virus doubles every hour. If the numbe  [#permalink]

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07 Mar 2019, 07:53
Bunuel wrote:
The number of cells killed by a virus doubles every hour. If the number of cells killed was initially 10^3, what is the number of cells killed after eight hours have passed?

A. 8(10^3)
B. (10^3)(10^8)
C. 2^8(10^3)
D. 2^4(10^3)
E. 2^8(10^8)

After 1 hour, the number of cells was 10^3 x 2, after 2 hours 10^3 x 2^2, …, and after 8 hours 10^3 x 2^8.

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Re: The number of cells killed by a virus doubles every hour. If the numbe   [#permalink] 07 Mar 2019, 07:53
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