In a survey of students about favorite sports the results include 33 who like football, 13 who like tennis and football, 24 who
like tennis and baseball, 26 who like football and baseball, 9 who like all three sports and 2 who like none of the sports. How many students like only tennis and football? How many students like only tennis and baseball? How many students like only baseball and football?
1 answer:
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Let n be unknown number, then 1/5 of this number is 1/5n. When you add these two numbers, you get
You know that this sum is equal to 24, so
1. Multiply this equation by 5:
2. Solve it:
Answer: n=20, correct choice is B.