Final answer:
When both balls are placed on the scale, the scale will read 0.60 pounds.
Step-by-step explanation:
To find the total weight when both balls are placed on the scale, we need to add the weights of the green ball and the orange ball. The green ball weighs 0.28 pounds and the orange ball weighs 0.32 pounds, so when placed on the scale together, the scale will read 0.28 pounds + 0.32 pounds = 0.60 pounds. Therefore, the scale will read 0.60 pounds