Answer:
2/3
Explanation:
You'll want both expressions to have the same denominator.
Let's make 2/5 into something divided by 15. Since 3*5 will give us 15, we'll multiply both 2 and 5 with 3.
Now we can easily add the 2 expressions.
Now, let's divide both 10 and 15 with 5 to simplify the expression.
Answer: 2/3