Answer:
The answer is 3.
Explanation:
First you multiple 3, by 10. 3x10=30.
Then you divide the answer by 5, 30/5=6.
Check your answer: 5x6=30.
For answers like this in the future, since it gives you hints, simply start with a number roughly around what you think it is, for example since it says it's a 1 digit number, you know to start low.