Idan tsawon rai bai ragu ba kuma bai daidaita ba, game da wace rukuni na ƙasashe muke magana? Bisa ga tambayar da ta gabata, ka rubuta mahallin da ke ɗauke da amsar. Zai iya zama jumla 1 - 20. Abubuwan da ke ciki:
Ga mafi yawan tarihin ɗan adam mafi girman matakan rayuwa na kayan aiki - cikar ciki, samun ruwa mai tsafta da ɗumi daga mai - ya haifar da ingantacciyar lafiya da tsawon rai. Wannan tsari na samun kudin shiga mafi girma-rayuwa mafi tsawo har yanzu yana ci gaba a cikin ƙasashe mafi talauci, inda tsawon rai ke ƙaruwa cikin sauri yayin da yawan kuɗin shiga na mutum ke ƙaruwa, amma a cikin 'yan shekarun nan ya ragu a tsakanin ƙasashe masu matsakaicin kuɗi kuma ya tsaya a cikin ƙasashe talatin mafi arziki a duniya. Amurkawa ba sa rayuwa a matsakaici (kimanin shekaru 77 a cikin 2004) fiye da Helenawa (shekaru 78) ko New Zealanders (78), kodayake Amurka tana da GDP mafi girma ga kowane mutum. Tsawon rayuwa a Sweden (shekaru 80) da Japan (82) <unk> inda aka rarraba kudin shiga daidai <unk> ya fi tsayi.