How come 66 in int sum2?

Question

int sum1=50+10;
int sum2=sum1+66;
intsum3=sum2+sum2;

Answer 1

It's just an example from the course to show how addition works in Java.

Answer 2

sum1 = 60
sum2 = 60 + 66
sum3 = 126 + 126

output of sum3 = 252