Green: 10 (looking at the purple's answer, which is 3.) 16-3-3= 10
Blue: 16
It is shown that they both 'weight' or are the same amount. So, it should be 16. The sun of 10(green) + 6 (the 2 purple)
2(purple) + (green) = blue
2*3 + 10 = 16
6 + 10 = 16
16 = 16