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Kath starts with a number. she adds 3 to her number then double the result. finally, she subtracts 7. if she ended with 9, what number did she start with?
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Kath starts with a number. she adds 3 to her number then double the result. finally, she subtracts 7. if she ended with 9, what number did she start with?

User Nicholas Shanks
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1 Answer

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The answer is 5. Work backwards: first add 7 to 9, then divide by 2, then subtract 3.

9+7=16
16/2=8
8-3=5

Cross Check:
5+3=8
8*2=16
16-7=9

Final Answer: 5
User Peter Tadros
by
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