In order to add these fractions we have to make a common denominator.
1/5 can turn into 2/10 Its the same thing. And its easier to solve with.
now lets multiply.
× 
Now we add across
2 + 1 = 3
------------
10 + 10 = 10 ( When adding fractions like these the denominator stays the same)
So your answer is...

Good Luck! :)
Answer:
⁶√2
Step-by-step explanation:
∛4 = (2^2)^1/3 = 2^2/3
So ∛4 / √2
= 2^2/3 / 2^1/2
= 2^1/6
= ⁶√2
You would have a maximum of 6 days
$160-$10 = $150
$150/$25=$6