All categories

1 year ago

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

You might be interested in

A horse is 17 hands tall at the hand equals 4 inches how tall is the horse in inches

Lilit [14]

<h3><u>68 inches</u></h3>

Because we know how large each hand is, we can multiply the number of hands by the amount of inches each one represents to find the total number of inches.

17 * 4 = 68

8 0

3 years ago

Read 2 more answers

What would a box and whisker plot look like for this?

Readme [11.4K]

58, 62, 71, 73, 84, 89, 91, 91, 93, 97, 98, 101,104

Five number summary:
1) minimum = 58
2) 1st quartile = 72
3) median = 91
4) 3rd quartile = 98
5) maximum = 104
    __________
  --------<u>|    | </u>|------------
58 72 91 98 104

3 0

3 years ago

A study found that a 95% confidence interval for the mean μ of a particular population was computed from a random sample of 1200

kotykmax [81]

Answer:

95% confidence interval for the mean μ is (6,14)

The Population mean μ lies between ( 6, 14 )

Step-by-step explanation:

<u><em>Explanation</em></u>:-

Given random sample 'n' = 1200

95% confidence interval for the mean μ is determined by

$(x^{-} -Z_{\alpha } \frac{S.D}{\sqrt{n} } , x^{-} +Z_{\alpha } \frac{S.D}{\sqrt{n} } )$

Level of significance = 95% 0r 0.05

Z₀.₀₅ = 1.96

$(x^{-} -Z_{\alpha } \frac{S.D}{\sqrt{n} } , x^{-} +Z_{\alpha } \frac{S.D}{\sqrt{n} } )$ = 10 ± 4

Mean of the small sample = 10

95% of confidence intervals are

( 10 ±4 )

( 10 -4 , 10+4)

( 6 , 14 )

95% confidence interval for the mean μ lies between ( 6, 14 )

8 0

3 years ago

Find the value of 81 3x

mezya [45]

Answer:

27 I think just divide 81 by 3

7 0

1 year ago

Chris has $100 in his savings account and he adds $20 a month to the account. The total amount can be represented by the linear

Greeley [361]

He should change how much he puts into his account each month to $50

7 0

3 years ago

Read 2 more answers

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

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