SOLUTION: Twice the sum of a number and 3 is 18. Find the number.

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Question 570833: Twice the sum of a number and 3 is 18. Find the number.
Answer by mathsmiles(68) About Me  (Show Source):
You can put this solution on YOUR website!
Let's take this one part at a time.
Let X be the number we're looking for.

Take the sum of this number and 3:
X+3
Two times this:
2(X+3)
is 18

So the equation is
2(X + 3) = 18
2X + 6 = 18
Subtract 6 from each side giving:
2X = 12
Divide both sides by 2 giving:
X = 6

Checking:
The sum of 6 and 3 is 9
Twice that is 9 X 2 = 18 Correct!