There were 30 people surveyed about their use of two brands: X and Y. The respondents are only allowed to choose X, Y, or both. The number of people surveyed who use Brand X only is twice that of people who use both Brands X and Y. If the number of people who use Brand Y only is thrice that of people who use both brands, how many people surveyed use Brand X only?
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Answer:
10
Step-by-step explanation:
because if there are 5 people who used both brand x and y, then the twice of it is 10 which was the the total number who use brand x only. And the thrice of 5 is 15 which was the total number of people surveyed who used brand Y only. so the total number of people surveyed who used brand x only is 10