9+a+b=20,a+b= 1 1
a+b+c=20,c=20-(a+b)=20- 1 1=9
b+c+d=20,
c+d+5=20,c+d=20-5= 15,d= 15-c= 15-9=6
b=20-(c+d)=20- 15=5
a = 1 1-b = 1 1-5 = 6
Let this number be 965965.