# How to form the number 8 from 5,5,5, and 1? [closed]

How would I be able to create the number $8$ from the numbers $5,5,5,1$ using only addition, subtraction, multiplication, and division. There is no factorial and no square root allowed.

Many thanks!

You didn't say whether you allow concatenation. I assume the desired solution is $8=5+\frac {15}5$ If you prefer decimals, you can do $\frac {1}{.5 \cdot .5 \cdot .5}$
• Do what? Find the answer or make the pretty $\frac {15}5$? We have lots of $5$s, so it is natural to look for $3$. Jan 27, 2017 at 15:44