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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