SOLUTION: Twice Jack's age plus 5 is 21. Write and solve an equation. How old is Jack?

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Question 883192: Twice Jack's age plus 5 is 21. Write and solve an equation. How old is Jack?

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let Jack's age = +x+
given:
+2x+%2B+5+=+21+
Subtract +5+ from both sides
+2x+=+16+
Divide both sides by +2+
+x+=+8+
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Jack is 8