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Question 24

The sum of 5 positive integers is 280. The average of the first 2 number is 40. The average of the third and fourth number is 60. The fifth number is


Correct Answer: 80

Solution

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The first two numbers sum to $$2\times40=80$$, and the third and fourth sum to $$2\times60=120$$. So the fifth number is $$280-80-120=80$$.

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