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# A laptop computer uses s fewer watts of electricity than a desktop com

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Math Expert
Joined: 02 Sep 2009
Posts: 64152
A laptop computer uses s fewer watts of electricity than a desktop com  [#permalink]

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19 Mar 2020, 03:59
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Question Stats:

69% (01:19) correct 31% (01:33) wrong based on 26 sessions

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A laptop computer uses s fewer watts of electricity than a desktop computer does. In combination, the 2 computers use t watts of electricity. Which of the following expressions represents the desktop computer’s electricity usage, in watts?

A. t/2 - s
B. (t + s)/2
C. t(s − 1)
D. t - s/2
E. t − 2s

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Re: A laptop computer uses s fewer watts of electricity than a desktop com  [#permalink]

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19 Mar 2020, 09:45
Bunuel wrote:
A laptop computer uses s fewer watts of electricity than a desktop computer does. In combination, the 2 computers use t watts of electricity. Which of the following expressions represents the desktop computer’s electricity usage, in watts?

A. t/2 - s
B. (t + s)/2
C. t(s − 1)
D. t - s/2
E. t − 2s

electricity of laptop = desktop-s
and L+d= t
d-s+d=t
2d=t+s
d=(t+s)/2
IMO B
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Re: A laptop computer uses s fewer watts of electricity than a desktop com  [#permalink]

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19 Mar 2020, 10:00
If desktop uses x

Then Laptop uses S less than Desktop ==> x-s

Both together use t

X+X-s=t
X=(t+s) /2

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Re: A laptop computer uses s fewer watts of electricity than a desktop com  [#permalink]

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21 Mar 2020, 14:52
Bunuel wrote:
A laptop computer uses s fewer watts of electricity than a desktop computer does. In combination, the 2 computers use t watts of electricity. Which of the following expressions represents the desktop computer’s electricity usage, in watts?

A. t/2 - s
B. (t + s)/2
C. t(s − 1)
D. t - s/2
E. t − 2s

We can create the equations:

L = D - s

L + D = t

Substituting, we have:

D - s + D = t

2D = t + s

D = (t + s)/2

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Re: A laptop computer uses s fewer watts of electricity than a desktop com   [#permalink] 21 Mar 2020, 14:52