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[#32] 2 Min. Challenge: Device

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CEO
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Joined: 15 Aug 2003
Posts: 3452

Kudos [?]: 926 [0], given: 781

[#32] 2 Min. Challenge: Device [#permalink]

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New post 26 Mar 2004, 17:30
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

138

1. Time yourself
2. Solve as fast as you can
3. Write down your solution here ,and your time

Mr. P, a mechanical engineer, has made three devices which he claims can reduce fuel consumption in cars by 25%, 30% and 45%, respectively. Mr. G buys these three devices and fits them into his car. The exact saving of fuel consumption will work out to (given that the three devices are independent in effect)

a. 100%
b. 71.125%
c. 65.25%
d. 75%
e. 80%

Kudos [?]: 926 [0], given: 781

Director
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Joined: 03 Jul 2003
Posts: 651

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 [#permalink]

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New post 26 Mar 2004, 17:44
My ans: b
Time = 3 mins

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GMAT Club Legend
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Joined: 15 Dec 2003
Posts: 4284

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 [#permalink]

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New post 26 Mar 2004, 19:28
B) between 2-3 min.
1 - .75*.7*.55 = .71125
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Best Regards,

Paul

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Senior Manager
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Location: India
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New post 27 Mar 2004, 02:00
In accord with PAUL, Answer should be: 71.125% (B)

Dharmin

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CEO
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Joined: 15 Aug 2003
Posts: 3452

Kudos [?]: 926 [0], given: 781

Re: [#32] 2 Min. Challenge: Device [#permalink]

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New post 27 Mar 2004, 08:06
praetorian123 wrote:
138

1. Time yourself
2. Solve as fast as you can
3. Write down your solution here ,and your time

Mr. P, a mechanical engineer, has made three devices which he claims can reduce fuel consumption in cars by 25%, 30% and 45%, respectively. Mr. G buys these three devices and fits them into his car. The exact saving of fuel consumption will work out to (given that the three devices are independent in effect)

a. 100%
b. 71.125%
c. 65.25%
d. 75%
e. 80%


Let us assume, before using the given three devices,
four-wheelers take X unit fuel.
By using all the three devices, fuel consumption will
reduced to

= X * (100тАУ25)* (100тАУ30)*(100тАУ45)
................................
100* 100 * 100
= 0.28875 X

Hence, percentage saving in fuel consumption

X - 0.28875X * 100 = 71.125%
................
X

Kudos [?]: 926 [0], given: 781

Re: [#32] 2 Min. Challenge: Device   [#permalink] 27 Mar 2004, 08:06
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[#32] 2 Min. Challenge: Device

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