put some apple slices in that paper bag with them. Ethylene gas will speed the process.

You can also try bananas in the bag, really helps.

Never tried bananas, but mango in paper bag made no difference for me and ripening mangos. I just put them on the counter, in 3-4 days they are ready. I put some in a bag, left others on counter, they were ready at the same time.

I guess if the mango's are very young, maybe, the paper bag might increase time.

I usually just leave on counter as well and they always ripen pretty quickly. We eat a lot of mangoes in my house.

First, you should put them in a large tumbler filled with water .Put 1 tablespoon of salt per litre in that water(to wash away all the pesticides and other chemical's ) .Take them out and wash after 20 minutes .Then let it dry.Now,wrap every mango in a newspaper seperately .You will see the results after a few day's .
Hope this help's........