Method 1: Prepare a clean plastic bag, put in some ripe bananas and apples, then put in mangoes to be cooked, then seal the bag and leave it for a day or two. Mature bananas and apples will release ethylene gas, which can play a role in ripening.

Method 2: spread a layer of paper in the rice jar, then put the mango on the paper, then pour the rice into the rice jar, and finally cover the rice jar. Rice will also release ethylene during storage, which will make mango mature.

Method 3: Concentrate mangoes in a carton, and then put the carton at a higher temperature. Due to the influence of temperature, mango itself will release more ethylene and mature in a few days.

Summary:

1. Put some ripe bananas and apples in the plastic bag, then put mangoes in it, then seal the bag and leave it for a day or two.

2. Spread a layer of paper in the rice jar, then put the mango on the paper, and finally pour the rice into the rice jar and cover it.

3. Concentrate mangoes in a carton, and then put the carton at a higher temperature.