SOLUTION: the sum of a number and 40 was 13 greater than 10 times the number. what was the number?

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Question 349214: the sum of a number and 40 was 13 greater than 10 times the number. what was the number?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
"the sum of a number and 40 was 13 greater than 10 times the number" means that x%2B40=10x%2B13


x%2B40=10x%2B13 Start with the given equation.


x=10x%2B13-40 Subtract 40 from both sides.


x-10x=13-40 Subtract 10x from both sides.


-9x=13-40 Combine like terms on the left side.


-9x=-27 Combine like terms on the right side.


x=%28-27%29%2F%28-9%29 Divide both sides by -9 to isolate x.


x=3 Reduce.


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Answer:

So the answer is x=3 which means that the unknown number is 3.


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Jim