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matrenka [14]
1 year ago
9

When a number is decreased by 10% of​ itself, the result is 81, what is the number?

Mathematics
1 answer:
stira [4]1 year ago
3 0

The number is 90.

<h3>What is the number?</h3>

Percentage can be described as the fraction of an amount that is expressed as a number out of hundred. The sign used to represent percentage is %. Percentages are a measure of frequency.

When the number is decreased, the number becomes smaller. This means that the original number is larger than 81.

The equation that can be used to represent the information in the question is:

(1 - percentage decrease) initial number = 81

(1 - 0.1)x = 81

0.9x = 81

x = 81 / 0.9

x = 90

To learn more about percentages, please check: brainly.com/question/25764815

#SPJ1

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Answer:

(90)(7) ⇒ the error was multiplying 90 and 7.


Step-by-step explanation:

12(597) = 12(500 + 90 + 7)

            = 12(500) + (90)(7)

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The part in bold shows where the error is. It was not correct to multiply 90 and 7.

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