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Travka [436]
2 years ago
13

1) What is 20% of 20? 2) what is 15 is what percent of 30? 3) 50 is 50% of what?

Mathematics
2 answers:
N76 [4]2 years ago
7 0

Hi there!

The word "of" is the same thing as a multiplication sign.

1)

20% = 0.2

0.2 × 20 = 4


2)

? × 30 = 15

divide each side of the equation by 30

? = 0.5

0.5 = 50%


3)

50% = 0.5

0.5 × ? = 50

divide each side of the equation by 0.5

? = 100


There you go! I really hope this helped, if there's anything just let me know! :)

zysi [14]2 years ago
3 0
<h3>QUESTION 1</h3>

What is 20% of 20?

To find the percent of a number, you have to change the percent into a decimal or a fraction and multiply by the number.

DECIMAL:

To change a percent into a decimal, remove the percent sign and move the decimal point 2 places to the left.

20 \% \rightarrow 0.2

Now that you have your decimal, multiply by 20:

0.2 \times 20 = 4

ANSWER  = 4

FRACTION:

To change a percent into a fraction, make the percent number as the numerator(top number) and 100 as the denominator(bottom number) since fractions are out of 100.

20 \% \rightarrow \frac{20}{100}

Now that you have your fraction, multiply by 20:

\frac{20}{100} \times 20 = \frac{400}{100} = 4

ANSWER = 4

<h3>QUESTION 2</h3>

15 is what percent of 30?

For questions like these, you have to divide. In this question, you have to divide 15 by 30 and change that into a percent.

First divide:

15 \div 30 = 0.5

Now you need to change the decimal into a fraction.

To change a decimal into a percent, you have to add a percent sign and move the decimal point 2 places to the right.

0.5 \rightarrow 50 \%

ANSWER = 50%

<h3>QUESTION 3</h3>

50 is 50% of what?

For this question, you can make an equation.

50 = 50 \% \times x

To make it easier, change 50% to a decimal:

50 \% = 0.5

Here is your new equation:

0.5 \times x = 50

x is your answer. To find your answer, you have to divide both sides by 0.5 to leave x alone. Divide:

0.5 \times x \div 0.5 = 50 \div 0.5 \\ x = 50 \div 0.5 \\ x = 100

ANSWER = 100

<em>If you have any questions, feel free to ask in the comments! :)</em>

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

The wind acts in the opposite direction to the plane when the time is longer.

The wind acts in the same direction as the plane when the time is shorter.

Equation

d = r*t

Givens

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Substitution

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Since the two distances are the same, you can equate the right hand sides.

  • (x + y) * 4 = (x - y)*5              Remove the brackets.
  • 4x + 4y = 5x - 5y                  Add 5y to both sides
  • 4x + 4y + 5y = 5x - 5y + 5y  Combine all the terms.
  • 4x + 9y = 5x                          Subtract 4x from both sides
  • 9y + 4x - 4x = 5x - 4x           Combine
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Now use one of the given equations with the distance

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  • 1720 = (9y + y) *  4      Combine
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  • 1720/40 = 40y/40      Do the division
  • 43 = y                          y = wind speek
  • 9y = x                          x = 9*y  
  • 9*43 = x
  • x = 387 miles per hour.
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