radioguy wrote:
Hi ,
can anyone help how to solve the following two problems ?
In a survey of political preference,70% of those asked were in favor of at least one of the proposals - |,|| & |||. 40% of those asked favoured | ,30% favoured || ,and 25% favoured proposal |||.If 5 % favoured all three of the proposals,what is the percentage of those asked favoured more than one of the proposals ?
P.S: Answer choices was not provided.
Source :4Gmat
Similar question to practice:
Quote:
In a survey of political preferences, 78% of those asked were in favour of at least one of the proposals: I, II and III. 50% of those asked favoured proposal I, 30% favoured proposal II, and 20% favoured proposal III. If 5% of those asked favoured all three of the proposals, what percentage of those asked favoured more than one of the 3 proposals.
(A) 10
(B) 12
(C) 17
(D) 22
(E) 30
Discussed here:
in-a-survey-of-political-preferences-78-of-those-asked-104770.htmlADVANCED OVERLAPPING SETS PROBLEMS:
advanced-overlapping-sets-problems-144260.htmlHope it helps.
Can you please share how to identify when to use the double set matrix method and when to use the formula or Venn Diagram while solving the problems related to overlapping sets.
I am not able to decide and it so happens that i go down the path using one approach but in the end realize that the one one would have worked better.