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jose477
03.07.2019 •
Mathematics
1) what is 20% of 20? 2) what is 15 is what percent of 30? 3) 50 is 50% of what?
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Ответ:
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.
Now that you have your decimal, multiply by 20:
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.
Now that you have your fraction, multiply by 20:
ANSWER = 4
QUESTION 215 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:
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.
ANSWER = 50%
QUESTION 350 is 50% of what?
For this question, you can make an equation.
To make it easier, change 50% to a decimal:
Here is your new equation:
x is your answer. To find your answer, you have to divide both sides by 0.5 to leave x alone. Divide:
ANSWER = 100
If you have any questions, feel free to ask in the comments! :)
Ответ:
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! :)
Ответ:
The answer for 12 - 9i = 24 - 3i is i = -2
The answer for 6a + 81 = 5a - 18 is a= -9