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!
How to form the number 8 from 5,5,5, and 1?
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$\begingroup$
arithmetic
recreational-mathematics
2 Answers
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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 $\frac {1}{.5 \cdot .5 \cdot .5}$
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0Sir how do you do that ?????? – 2017-01-27
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0Do what? Find the answer or make the pretty $\frac {15}5$? We have lots of $5$s, so it is natural to look for $3$. – 2017-01-27
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0You can't concatenate. !!! Really if you do that that's breaking the rules of mathematics.... – 2017-01-27
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0In puzzles like this concatenation is often allowed. The first one I saw, which was *long* ago, was [four fours](https://en.wikipedia.org/wiki/Four_fours). You just need to be clear on the rules. Sometimes decimal points are allowed, sometimes repeating fractions. With your rules there may not be an answer. – 2017-01-27
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Are you missing two more 5 s from the picture , if you really missed then we can use (((5+1)*5)+5+5)/5 =8 otherwise it's no way possible to get 8 with your question...