Kathi starts with number. she adds 3 to her number then doubles the resut. finally, she sustracts 7. if she ended with 9, what number did she start with?

Question

Mathematics

Kyler Wong

16 February, 22:54

Kathi starts with number. she adds 3 to her number then doubles the resut. finally, she sustracts 7. if she ended with 9, what number did she start with?

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Ronnie Day · Answer 1

If the number is x, then 2 * (x+3) - 7=9 due to that you subtract the result of double of x+3. Adding 7 to both sides, we get 2 * (x+3) = 16. Next, we divide both sides by 2 to get x+3=8 and subtract 3 from both sides for our final result, x=5