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Mathematics 19 Online
OpenStudy (anonymous):

easy math!

OpenStudy (anonymous):

OpenStudy (anonymous):

@pooja195

OpenStudy (anonymous):

@abb0t

OpenStudy (solomonzelman):

20% of some number is 80.

OpenStudy (solomonzelman):

20% of x is 80.

OpenStudy (solomonzelman):

Normally, when you are given a problem, such as: What is 10% of 100, you do this: \(\color{black}{100\times \dfrac{1}{10}}\)

OpenStudy (solomonzelman):

This time you are given that: \(\color{black}{\color{blue}{x}\times \dfrac{1}{20}=80}\)

OpenStudy (solomonzelman):

Do you understand how I am arriving at this equation?

OpenStudy (anonymous):

so the anewer is 1/20?

OpenStudy (anonymous):

i can't fin the answer @SolomonZelman

OpenStudy (freckles):

replace of with times and is with equals and % with times 1/100 \[20 \% \cdot x=80 \\ 20 \cdot \frac{1}{100} \cdot x=80\] solve for x

OpenStudy (freckles):

reduce 20/100 first

OpenStudy (freckles):

@ekkerking you there?

OpenStudy (anonymous):

its 400 guys the answer

OpenStudy (freckles):

\[\frac{20}{100}x=80 \\ \frac{1}{5}x=80 \\ x=80 \cdot 5=400\] yep good job

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