300
1) In this case, let's set the equation to find this:
[tex]\begin{gathered} \frac{5n}{10}=150 \\ \\ 10\times\text{ }\frac{5n}{10}=1500 \\ \\ \frac{5n}{5}=\frac{1500}{5} \\ \\ n=300 \\ \end{gathered}[/tex]Note that since we can set in this equation "n" as the number, we can tell that 300 x 5 and then divided by 10 is 150.
2) Thus, the answer is 300
