The answer depends on the location of the two and their genders.
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21.
The LCM is 1302.
The Least Common Multiple (LCM) of 21, 33, and 31 is 7,161.
21 is composite number that is a multiple of 3. 31 is a prime number.
16+10= 26 26-5= 21 21+10= 31 31-5= 26 The answer is 26