June 14, 2021 9:29 am
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June 14, 2021 9:30 am
Topic starter
If the average of the four elements is 13, their total must be 13 x 4=52, so 6 + 21 + x + y=52, and thus x + y=25. So if x and y add up to 25 and their product is 100, then they could be 20 and 5. 5 is not an option, the answer is 20.