i need help with this problem please

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In particular, in order to help you, we need to know something about what you have learned, what you have tried, and where you are stuck.

Have you tried writing an equation, using a variable to represent the number? Please show us, so we can correct it or guide you to the next step.
 
Similar wording, using a known number:

"When 110 is decreased by 10% of itself, the result is 99."

110 - 0.10(110) = 99
 
If you decrease a number by 10%, then what part of the number is left?
 
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