Problem / game
First name
Mahnoor
School
Greenacre Public School
Country
Age
10
The answer for this question is 210. I did it by writing down a list of :
Multiples of five,
Triangular numbers,
Multiples of 3 but not 9,
Even, but not multiples of 4.
Therefore, by doing this, I found a common number from all of these, and that's how I got my answer.