There wear 10000 bugs in a mountain in the train there are 15 bug how many bugs in all
2 answers:
There are 10000 bugs and you add 15 bugs to it.
10,000+15= 10,015
The total is 10,015 bugs
There were already 10,000 bugs and 15 bugs joined them.
Which makes it an addition statement
So if there's 10,000 bugs in a mountain and 15 bugs in the train, then 10,000 + 15 = 10,015 because in all means to add.
You might be interested in
Answer:

Step-by-step explanation:
Move
to the denominator in 
using the negative exponent rule 
Answer D.

The answer is 0.444 repeating.
Answer
-1
Step-by-step explanation:
Just plug in the numbers.