adding up dragged items

Hi, I'm creating a short interaction which will help people learn about how much calcium they need to eat. I've made a cute little slide where you get to drag different foods and rank them in order of which have more calcium. If you put them in the wrong spot they just bounce back, and once they are in the right order they each show underneath how much calcium they have in them.

I would LOVE to be able to create a slide where you would have a heap of different pictures of foods, and you would drag them into a basket, or onto a table or some such thing, and it would tell you if you had put in enough to meet your daily requirement. Even better, would be some sort of measuring arrow that moved according to how much was in the basket.

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