anonymous
  • anonymous
81 is 120% of what number?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
17.220 = 17.22
anonymous
  • anonymous
how did you get that?
anonymous
  • anonymous
amu12, here is an easy way to think of percentage questions and fractions. Whenever you see the word "of" think of multiplication. So, 50% of 100 is, 50% * 100, which is 50. So, to answer your question, 120% of ? = 81 is written as 120% * ? = 81 we can also write it as 120/100 * ? = 81 Now, let's simplify it, 1.2 * ? = 81 In algebra to find an answer, we have to isolate the unknown right? So we have to isolate the question mark... how do we do that? We do that by moving 1.2 to the other side. We end up with ? = 81/2.1 so, we do some easy division, and we find the answer is 67.5 And you can check your work by plugging it back in. Good luck!

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anonymous
  • anonymous
i multiplyed .820 by 21
anonymous
  • anonymous
beacuse ure finding 820%
anonymous
  • anonymous
still how do you do it? i dont get it ......
anonymous
  • anonymous
ok so
anonymous
  • anonymous
That is actually incorrect, Hermella. They are not asking for 820% of 21, they are asking for what number multiply by 120% gives you 82. And 820% is not .82, it is 8.2 Please look at my post for detailed explanation, amu
anonymous
  • anonymous
you are finding 820% so you multiply .825 by 21 because it is 825% of 21
anonymous
  • anonymous
get it
anonymous
  • anonymous
??????
anonymous
  • anonymous
so what don't you get
anonymous
  • anonymous
amu what dont you get
anonymous
  • anonymous
so i am still not getting how to solve it.....!!! ????
anonymous
  • anonymous
btw im still on
anonymous
  • anonymous
amu
anonymous
  • anonymous
yea so how exactly did you do it
anonymous
  • anonymous
i multiplyed .820 by 21
anonymous
  • anonymous
get it

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