BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course
RedeemTarget Test Prep · GMAT
Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.
TTP has worked incredibly hard to build the best test prep experience possible, and winning Newsweek’s 2026 Readers’ Choice Award for Best Test Prep would mean a lot to them. If TTP has helped you, they’d be incredibly grateful for your vote. You can vote once each day through September 9.
with Chris Peckover
with Logan Thompson
Complete access from day one. Study on your schedule.
Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.
karthikpandian19 wrote:All 250 files on Sam's hard drive are infected by either a virus or a worm or both. The number of files that are infected only by a worm is 2.5 times the number of files that are infected by both a virus and a worm. If 50% of the files were not infected by a virus, how many of Sam's files were NOT infected by a worm?
50
70
75
100
125
2.5x = 250/2If 50% of the files were not infected by a virus
y + x + 2.5x = 250how many of Sam's files were NOT infected by a worm?
rijul007 wrote:karthikpandian19 wrote:All 250 files on Sam's hard drive are infected by either a virus or a worm or both. The number of files that are infected only by a worm is 2.5 times the number of files that are infected by both a virus and a worm. If 50% of the files were not infected by a virus, how many of Sam's files were NOT infected by a worm?
50
70
75
100
125
Let No of files affected by both Virus and worm be x
No of files affected by worm only = 2.5 x
2.5x = 250/2If 50% of the files were not infected by a virus
2.5x = 125
x = 50
y + x + 2.5x = 250how many of Sam's files were NOT infected by a worm?
y + 50 + 125 = 250
y = 250 - 175 = 75
Option C
B = 2.5CThe number of files that are infected only by a worm is 2.5 times the number of files that are infected by both a virus and a worm.
This means 50% are affected by worms only = B = 250/2 = 125If 50% of the files were not infected by a virus,
You are asked to find the number of files affected by Virus ONLY = A = 250 - (B+C) = 250 - (125 + 50 ) = 75how many of Sam's files were NOT infected by a worm?
rijul007 wrote:Heres another explaination
Lets say
number of files affected by Virus only = A
number of files affected by Worms only = B
Affected by both = C
A + B + C = 250
B = 2.5CThe number of files that are infected only by a worm is 2.5 times the number of files that are infected by both a virus and a worm.
This means 50% are affected by worms only = B = 250/2 = 125If 50% of the files were not infected by a virus,You are asked to find the number of files affected by Virus ONLY = A = 250 - (B+C) = 250 - (125 + 50 ) = 75how many of Sam's files were NOT infected by a worm?
New here Create free account
