BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

copy machine

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 135
Joined: Mon Oct 03, 2011 6:54 am
Followed by:4 members

copy machine

by nidhis.1408 » Tue Nov 22, 2011 4:06 pm
A certain copy machine is set to reduce an image by 13%. If Steve photocopies a document on this machine, and then photocopies the copy on the same machine, what percent of the original will his final image size be?
Top
Source: — Problem Solving |
Master | Next Rank: 500 Posts
Posts: 385
Joined: Fri Sep 23, 2011 9:02 pm
Thanked: 62 times
Followed by:6 members

by user123321 » Tue Nov 22, 2011 4:55 pm
nidhis.1408 wrote:A certain copy machine is set to reduce an image by 13%. If Steve photocopies a document on this machine, and then photocopies the copy on the same machine, what percent of the original will his final image size be?
let initial size be x
after photocopying it will be 0.87*x = 0.87x
after photocopying the photocopy it will be 0.87*0.87x
=> almost 0.76x =>nearly 76%

user123321
Just started my preparation :D
Want to do it right the first time.
Top
Legendary Member
Posts: 1084
Joined: Fri Apr 15, 2011 2:33 pm
Thanked: 158 times
Followed by:21 members

by pemdas » Tue Nov 22, 2011 4:58 pm
to reduce by 13% is to leave new image 87% OR 0.87

in life, it's 0.87*0.87 should be 0.64 < final image <0.81

>>>to assess more precisely take 7 units after 0.80 (0.87) and distribute on the 10-unit line
difference (0.81-0.64)/10=0.017 -> 0.017*7=0.119; 0.64+0.119=0.759 (it must be very close)

final ans: ~76%
nidhis.1408 wrote:A certain copy machine is set to reduce an image by 13%. If Steve photocopies a document on this machine, and then photocopies the copy on the same machine, what percent of the original will his final image size be?
Success doesn't come overnight!
Top
Post new topic Post Reply
• Page 1 of 1