In the image above, the antipasto platter delivery is worth 3 coins which will take the gems down by 35.
The Greek salad is worth 2 coins when delivered so will take the gems down by 15.
So once I have completed both those deliveries, all I will need to complete day six are two deliveries worth 1 coin (5 gems) each. I can then,
before making the last delivery to the ship for the day try to set up the other two orders (by refreshing them) so that I have two 4 coin deliveries waiting overnight. I can then try to work on having them ready and waiting to deliver when day 7 unlocks for me tomorrow. This saves me time and effort in the long run.