SOLUTION: If 2 nos. = 57 and one no. is 21 what is the equation to find the missing no.?

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Question 590355: If 2 nos. = 57 and one no. is 21 what is the equation to find the missing no.?
Answer by Alan3354(69443) About Me  (Show Source):
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If 2 nos. = 57 and one no. is 21 what is the equation to find the missing no.?
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If 2 nos. = 57 ?? Are both 57?