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[#32] 2 Min. Challenge: Device
[#permalink]
26 Mar 2004, 17:30
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%
Archived Topic
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This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
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Re: [#32] 2 Min. Challenge: Device
[#permalink]
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
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.