156320

This is how I did it:
So what I do is I lay my numbers on the sheet .
Q1 has to be a multiple of 5
Q2 has to be a triangle no.
Q3 has to be even but not divisible by 4
Q4 has to be a multiple of three but not nine

So for the first one
5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,90,100
Second , but now it has to be a triangle number too
10,45,55,105,120,190,210,300
Third,now it has to be even but not a multiple of four
10,190,210
Fourth,now it has to be a multiple of 3 but not 9
210
So our answer is 210.so this is how I do my workings