An Online Problem.

Algebra Level 2


The answer is 8.

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2 solutions

Winston Choo
Sep 7, 2018

The difference between 21 and 47 is 26, and the difference between 47 and 60 is 13.

Note that 13:26 is 1:2, which makes (1 + 2) = 3 units

Since 21 is not the least of the 5 numbers, it must be the 2nd least (If it's 3rd least there would only be 2 units of space left and so on)

Hence, the least of the 5 numbers is 21 - 13 = 8

Hana Wehbi
Sep 9, 2018

This was a problem posted in one Math Olympics, so l am posting the problem with the solution from the original source.

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