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Dominik [7]
3 years ago
7

25% of what number is 21?

Mathematics
2 answers:
BaLLatris [955]3 years ago
7 0
Let the unknown number be x.

25% of x is 21

25% * x = 21

0.25 * x = 21

0.25x = 21

0.25x/0.25 = 21/0.25

x = 84

Answer: The number is 84.
Tcecarenko [31]3 years ago
5 0
Hey there! :D

25% represents a quarter of a number. 

If 21 is a quarter of a number, multiply it by 4. 

21*4= 84

21 is 25% of 84. 

I hope this helps!
~kaikers
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3 years ago
Regis leans a 10-foot ladder against a wall. The base of the ladder makes a 65 angle with the ground.
hammer [34]

The distance, In feet, from the base of the ladder to the base of the wall is 4.2 ft.

He needs to move the ladder 0.1 ft closer to the base of the building.

The situation forms a right angle triangle.

<h3>Right angle triangle</h3>

Right angle triangle has one of its angles as 90 degrees. The sides and angle can be found using trigonometric ratios.

The length of the ladder is the hypotenuse of the triangle formed. Therefore, the distance, In feet, from the base of the ladder to the base of the wall can be calculated as follows;

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d = 10 × 0.42261826174

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She needs to move the ladder so it reached a window 9.6 feet above the ground. Therefore, the distance from the base of the ladder and the wall is as follows;

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d = 4.05696

d = 4.1

Therefore, he needs to move the ladder 0.1 ft closer to the building.

learn more on right angle triangle here: brainly.com/question/14988069

8 0
2 years ago
What is 1.9 million plus 8.7 million?<br><br> Thanks so much!!!!!
Tju [1.3M]
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7 0
2 years ago
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3 0
3 years ago
21 is 20% of what number
Ksenya-84 [330]

Answer:

21 is 20% of 105

Step-by-step explanation:

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If you are using a calculator, simply enter 21×100÷20, which will give you the answer.

6 0
3 years ago
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