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It only takes about 7000 grains of rice for one decent meal, that's about 700 questions. I know, that seems a lot, but believe me, the questions are quite easy and not very complicated, so you can earn a lot of rice in quite a short time.
At first I didn't understand how this could work as you don't donate money or food, but I found out that the rice is funded by the money raised by the advertisements under the question box.
Sometimes it only takes a small thing for one person that'll make a huge difference if a lot of people work together. Even if you don't have time to raise a whole meal a day, it'll make a difference nonetheless.
In light of this I really hope you'll take a little of your precious time and spend it on this wonderful project.
Xoxo, have fun helping other people!