I think the question may refer to which two squares differ by 21. Two solutions :
112 - 102 = 121 - 100 = 21.
52 - 22 = 25 - 4 = 21.
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when you subtract one square number with another the answer is 16 what are the two numbers
4 and 1.
1 and 9.
52 - 32 = 16.
42 - 32 = 7