Question

4. What is my number?

Clue 1. My number is a multiple of 2 and 5.

Clus 2. My number is greater than 10 but less than 50.

Clue 3. The number 3 is a factor of my number.​

Answer 1

30

Explanation:

A number that is a multiple of 2 and 5 is a multiple of 10.

A multiple of 10 between 10 and 50 can only be 20, 30, 40.

3 is not a factor of 20 or 40, but it is a factor of 30.

Answer: 30