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If we use the approach of simple equations or venn diagram, then with the given information we can make out that-

Number of only red roses - 15x
Number of only white roses = x/3
Number of only yellow roses = 25x/3

on adding the 3, we get 71x and there is only one option that is divisible by 71 and that is option C
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Could you please explain, I am not following. If you add all 3, won't you get (71*x)/3?
Bunuel GMATNinja could you please help? 
karu26
If we use the approach of simple equations or venn diagram, then with the given information we can make out that-

Number of only red roses - 15x
Number of only white roses = x/3
Number of only yellow roses = 25x/3

on adding the 3, we get 71x and there is only one option that is divisible by 71 and that is option C
­
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Could you please explain, I am not following. If you add all 3, won't you get (71*x)/3?
Bunuel GMATNinja could you please help?
karu26
If we use the approach of simple equations or venn diagram, then with the given information we can make out that-

Number of only red roses - 15x
Number of only white roses = x/3
Number of only yellow roses = 25x/3

on adding the 3, we get 71x and there is only one option that is divisible by 71 and that is option C
­
­Only W= x
R+W= 3x
Only R= 45x
Only Y= 25x

Tot of above= 71x
TF, only 213 is divisble by 71 to give us an integer val for x (as we cannot have half roses ofc).
Sharing basis my understanding, hope this helps.
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