SOLUTION: If a number is increased by 21, the result is 30. What is the number?

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Question 6057: If a number is increased by 21, the result is 30. What is the number?
Found 2 solutions by Abbey, CharStar:
Answer by Abbey(339) About Me  (Show Source):
You can put this solution on YOUR website!
let x = the number
x+21=30
subtract 21 from both sides:
x=9
the number is 9

Answer by CharStar(110) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = a number - (1) number
x + 21 = 30
x + 21 = 30
Subtract 21 from both sides
x = 9
Check your answer
9 + 21 = 30