The sum of 21 and an unknown number is equal to 30.
A. 21b = 30
B. 21 + b = 30
C. 21 : b = 30
D. 21 - b = 30
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Home » Mathematics » Which equation best represents this situation? The sum of 21 and an unknown number is equal to 30. A. 21b = 30 B. 21 + b = 30 C. 21 : b = 30 D. 21 - b = 30