Question

what is the answer to my mystery number has 5 tens and 29 ones?

Answer 1

Omg so mysterious :O
I'm guessing that this spooky number is 79...

Answer 2

To find the solution:
5 tens is also 10+10+10+10+10 or 50.
29 ones can be added to 50 to get 79. The answer is 79!