what is 20% of 2/3 of 15?
a) 1
b) 2
c) 3
d) 4
f) 5

- anonymous

what is 20% of 2/3 of 15?
a) 1
b) 2
c) 3
d) 4
f) 5

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- anonymous

do you mean like 20% x 2/3 x 15?

- anonymous

I'm not very sure. This is exactly what I had on my paper. @Rose6

- anonymous

oh ok sorry i couldn't help much

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## More answers

- anonymous

It's ok. Thanks though @Rose6

- anonymous

no prob. :)

- anonymous

first u gotta do is 2/3 times 15
to find what two third of 15 is

- anonymous

\[\frac{ 2 }{ 3 }\times15\]

- anonymous

dont answer the question look at the code plz

- anonymous

we have to tell them how to solve not telling them answers

- anonymous

Sorry, but what code? @jkim3592

- anonymous

Code of Conduct

- anonymous

Hello! You have to work backwards on this one. The first step is to find 2/3 of 15. Do you know how to do that?

- anonymous

not really...

- anonymous

ok. well 15 is equal to 15/1, you understand that, right?

- anonymous

yes I do.

- anonymous

good. to multiply fractions, you take the top two and multiply them, and do the same with the bottom two. so a/b times c/d is equal to ac/bd

- anonymous

now try to multiply 2/3 and 15/1.

- anonymous

ok.

- anonymous

did you get it?

- anonymous

would it be 30/3? or 90/3?

- anonymous

it would be 30/3

- anonymous

sorry if i wasn't clear on the "a/b times c/d" thing

- anonymous

Thats ok, no problem.

- anonymous

so what's 30/3?

- anonymous

so now, would the answer be 1?

- anonymous

be careful there. try again with 30 divided by 3

- anonymous

10 I mean.

- anonymous

10/20 = 2

- anonymous

10 is right! now for the 20% of 10. We need to convert the percent to a decimal before we use it to multiply. can you convert 20% to a decimal?

- anonymous

.20

- anonymous

right? or .02

- anonymous

you were right, .20

- anonymous

now multiply .20 by 10.

- anonymous

2! :D

- anonymous

yup.

- anonymous

Thank you very much!

- anonymous

no problem

- anonymous

anytime

- anonymous

would you min helping me on another problem please? If not, it's fine. :)

- anonymous

of course!

- anonymous

Great!

- anonymous

After two months on a diet, John's weight dropped from 168 pounds to 147 pounds. By what percent did John's weight drop?

- anonymous

ok. So what was john's original weight?

- anonymous

147. So what I have up to right now is 168/147.

- anonymous

I'm sorry. I meant to type 147/168.

- anonymous

well, there are a couple of ways to do this problem. The number you have right now (147/168) is the percent for how much he has right now

- anonymous

can you convert 147/168 to a percent?

- anonymous

1.14% ?

- anonymous

well, what's 147 divided by 168? give me the decimal value

- anonymous

My appologies, this is probably very easy but I'm not sure what decimal value is...or dont remember.

- anonymous

for example 1/2 is .5 in decimal

- anonymous

1/2 is a fraction, .5 is a decimal, and 50% is a percent

- anonymous

.27

- anonymous

not quite. what's 147 divided by 168?

- anonymous

.87
I don't know where I got .27 from.

- anonymous

it's actually .875. your calculator might be cutting it off or something

- anonymous

the whole thing showed but I didn't think I needed to type the 5. Ok, now I know.

- anonymous

sometimes you don't, but for this one you do :)
ok. so we know .875 or 87.5% is how much John has left, so we need to take that number away from 100%. so what's 100%-87.5%?

- anonymous

It is 12.5

- anonymous

and that's how much he lost, which is the answer! I'm not sure if the way we solved this is the way your teacher wanted you to. do you want me to show you another way?

- anonymous

Sure. 12.5 would equal to 12 1/2 correct? This is one of the answers I have on my paper.

- anonymous

Actually, you don'need to. It's fine. :)

- anonymous

that's right!

- anonymous

Thank you very much! Would you mind helping me again please? You're a great help. :)

- anonymous

keep them coming! :P

- anonymous

happy to help

- anonymous

Great!

- anonymous

Which expression is equivalent to 0.01?
(wait one moment please.)

- anonymous

|dw:1378171198967:dw|
2) 0.01/10
3) 1/100
4) 1/100/1/10
5) 1/10^4

- anonymous

ok.

- anonymous

so let's look at number one. Do you know how to simplify that?

- anonymous

Nope.

- anonymous

ok. So what does that symbol mean? the one that kind of looks like a check mark

- anonymous

I know this, but I forgot. My apologies..

- anonymous

That's ok. It is the square root symbol. Do you remember how it works?

- anonymous

Oh right. Sort of.

- anonymous

|dw:1378171733682:dw|

- anonymous

and the square root of ten?

- anonymous

1=1
10=3.162 ?

- anonymous

oops, my bad. i meant to type 100, not ten

- anonymous

what's the square root of one hundred?

- anonymous

um...10?

- anonymous

yup! Do you understand what i did in the drawing?

- anonymous

Sort of... :/

- anonymous

the square root of a fraction is the same thing as the square root of the top number divided by the square root of the bottom number. Anyways, the square root of 1 is 1, you're right! and the square root of 100 is 10, right! so what is 1/10 as a decimal?

- anonymous

0.1

- anonymous

and is that equal to 0.01?

- anonymous

No. Wait how would it be equal to 0.01?

- anonymous

right-it's not. so the answer isn't not number one. let's look at number two. what is 0.01 divided by 10?

- anonymous

It's 0.001so it wouldnt be number two right?

- anonymous

exactly. how about number 3?

- anonymous

0.0001 so no.

- anonymous

you might be looking at the wrong problem

- anonymous

number 3 is 1 divided by 100.

- anonymous

oh right. I did it wring. 1/100 is 0.01!

- anonymous

yup

- anonymous

i dont think we need to check number 4 and 5

- anonymous

:P

- anonymous

Sweet!

- anonymous

haha! Oh, I have a few more, would you mind? :)

- anonymous

Just two more...

- anonymous

of course not, go right ahead!

- anonymous

You are so rad! Thank you.

- anonymous

no problem

- anonymous

If 8 kilograms of alcohol are added to 17 kilograms of pure water, what percent by weight of the resulting solution is alcohol?
a) 8%
b) 17%
c) 32%
d) 68%
e) 35%

- anonymous

ok. So we need to find the final amount of kilograms. How do we find how much is left at the end?

- anonymous

we have 17 kg of water and we add 8 more kg of alcohol. how much kg do we have left?

- anonymous

* how many kilograms do we have left

- anonymous

9 kg. I am really not sure. :/

- anonymous

so we have 17 kg of water, right?

- anonymous

yes.

- anonymous

we add 8 more kg of alcohol. How many kilograms of "stuff" do we have now?

- anonymous

25kg

- anonymous

right! and how much of that is alcohol?

- anonymous

8kg

- anonymous

exactly! so the amount of alcohol is 8 kg / 25 kg. what is 8/25 in percent form?

- anonymous

32%

- anonymous

yup. So the answer is...

- anonymous

C!

- anonymous

good job!

- anonymous

Thank you very much, you are great. I need to go...I will be back on later tonight. I don't know if you will be too, but if you are, then great. :) I really appreciate your help.

- anonymous

no problem.

- anonymous

bye!

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