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Mathematics 20 Online
OpenStudy (samara8954):

Solve for n.

OpenStudy (solomonzelman):

What is the full question?

OpenStudy (samara8954):

n = 48 n = 8 n = 6 n = 126

OpenStudy (samara8954):

that is the full question

OpenStudy (solomonzelman):

can you reduce the fraction, 6/18 ?

OpenStudy (samara8954):

1/3

OpenStudy (solomonzelman):

Yes.

OpenStudy (solomonzelman):

So now we have: \(\LARGE\color{black}{ \frac{1}{3}=\frac{n}{24} }\)

OpenStudy (solomonzelman):

Then cross multiply.

OpenStudy (samara8954):

what?

OpenStudy (solomonzelman):

ohh, I see, when we cross multiply we do this: For example if we had: \(\LARGE\color{black}{ \frac{2}{3}=\frac{6}{x} }\) then the cross multiplication gives us: \(\LARGE\color{black}{ 2\times x=3 \times 6 }\) and on...

OpenStudy (samara8954):

9

OpenStudy (solomonzelman):

yes, x would be nine, good:)

OpenStudy (solomonzelman):

Okay, so in our case, when we have, \(\LARGE\color{black}{ \frac{1}{3}=\frac{n}{24} }\) do you know how we would multiply?

OpenStudy (solomonzelman):

if don't know, then say so, please...

OpenStudy (samara8954):

I don' t know

OpenStudy (solomonzelman):

Okay:

OpenStudy (solomonzelman):

We are multiplying like this: \(\LARGE\color{black}{ \frac{\color{red}{1}}{\color{blue}{3}}=\frac{\color{blue}{n}}{\color{red}{24}} }\) \(\large\color{black}{ \color{red}{1} \times \color{red}{24} =\color{blue}{n}\times \color{blue}{3} }\)

OpenStudy (solomonzelman):

get it?

OpenStudy (samara8954):

so 8 is the answer

OpenStudy (solomonzelman):

Yes, it is 8.

OpenStudy (solomonzelman):

Can you answer a small quick question for me?

OpenStudy (samara8954):

okay

OpenStudy (solomonzelman):

I'll ask it: If we had, \(\LARGE\color{black}{ \frac{3}{2}=\frac{x}{5} }\) how would we multiply (cross multiply) ? (without even giving me what x is going to be equal to)

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