SOLUTION: A certain number is 3 more than another number. If their sum is 21, find their numbers

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Question 785151: A certain number is 3 more than another number. If their sum is 21, find their numbers
Answer by harpazo(655) About Me  (Show Source):
You can put this solution on YOUR website!
x + 3 + x = 21
2x + 3 = 21
2x = 21-3
2x = 18
x = 18/2
x = 9
One number is 9 and the other is 3 more than 9 or 12.