Would a jar of rice?..?

By our family as norm, one jam jar of rice is enough for at least 6 people. I would think 50% more, say 9 to may be 10, in a third world if they were given smaller portions in order to go further. But if the same quantity of rice were to make into congee (porridge), the number of mouth you can feed may even go up to 15.
This is not exact science. I am assuming the jam jar is the average 5oz. size and the congee is not thick gruel.

It would be nice to know how big the jar is.

You first need to identify a few things:

1. What is the daily caloric need for those children. And do you use the minimum number to sustain life or a larger number of calories that would help them thrive. Rice provides carbohydrates, but very little protein and fats - and hardly any vitamins or minerals. It may keep death away for a while - but if the person only ate rice it would result in malnutrition pretty quickly. So you may have to ignore some facts in your statement about how rice alone would help world hunger.

2. Establish if your jar is going to contain cooked or raw rice - and how many calories of rice that jar contains.

3. Find out how much rice your jar contains, to figure out how many calories are in that jar.

With those data points, you can figure out the rest. You might want to start your research at: http://www.freerice.com/ which allows you to play a fun vocabulary game and donate rice at the same time.

Good luck!

im just estimating it but i think one jam jar filled with rice would probably feed three average kids

rice is a bad example as you would have to think about the food hygiene issue of storage and reheating

Depends on how you cook the rice. If you're making fried rice, then you'll feed less children. If you're making rice porridge, you'll feed more (and more if you use more water and less rice).

Say a jam jar is equivalent to 5-6 cups of uncooked rice. If you cook all of them as rice then you'll get around 16-20 small bowls. If you're making rice porridge, you can easily make 40 bowls of porridge, thus feeding more kids.

I am not sure how much a kid in a third world country eats vs. a kid in North America or any developed country eats. But I would say, if you give the rice to the kid in the third world country, s'he'll do anything to make it last longer, so s/he be eating rice porridge for awhile. Whereas the kid in a developed country won't worry about running out (because the store is just around the corner), so s/he'll be making fried rice for dinner.

Sorry, I don't have any statistics or averages.