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Lerok [7]
3 years ago
15

The difference between 3 times a number and 21 as an expression

Mathematics
1 answer:
Agata [3.3K]3 years ago
3 0

\bf \stackrel{\textit{number}}{x}~\hspace{5em}\stackrel{\textit{three times a number}}{3x}~\hspace{5em}\stackrel{\textit{difference of 3x and 21}}{3x - 21}

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adell [148]

Hey there! I'm happy to help!

When talking about percents, the word "is" usually means equals. Let's use this to solve an equation! We will call our number n. Note that 30% is equal to 0.3 in decimal form because 0.3 is 30% of one! :D

0.3n=45

To solve, we need to isolate the n. To do this, we divide both sides by 0.3 because this cancels out the 0.3 that is being multiplied by n and it shows us what n will then equal.

0.3n÷0.3=45÷0.3

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Therefore, 30% of 150 is 45. Try multiplying 0.3 by 150 and you will get 45!

Have a wonderful day! :D

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