Lorena Lester

2022-07-16

How did they get 2n + 10 here?

Daniel can encode a paper in $5$ hours and together he and Dennis can encode it in $2$ hours, how long would it take Dennis to encode the same paper alone?

$\frac{1}{5}+\frac{1}{n}=\frac{1}{2}$

$2n+10=5n$

$10=3n$

$n=\frac{10}{3}$

$n=3{\displaystyle \frac{1}{3}}$

Daniel can encode a paper in $5$ hours and together he and Dennis can encode it in $2$ hours, how long would it take Dennis to encode the same paper alone?

$\frac{1}{5}+\frac{1}{n}=\frac{1}{2}$

$2n+10=5n$

$10=3n$

$n=\frac{10}{3}$

$n=3{\displaystyle \frac{1}{3}}$

cindysnifflesuz

Beginner2022-07-17Added 19 answers

They simply used ::

$\frac{1}{5}+\frac{1}{n}=\frac{1}{2}$

$\frac{5+n}{5n}=\frac{1}{2}$

$\begin{array}{}\text{(basics of fraction addition)}& 10+2n=5n\end{array}$

$\frac{1}{5}+\frac{1}{n}=\frac{1}{2}$

$\frac{5+n}{5n}=\frac{1}{2}$

$\begin{array}{}\text{(basics of fraction addition)}& 10+2n=5n\end{array}$

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