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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?
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