 
<translate> Ọ bụrụ na ha nọrọ izu abụọ n'oge nke abụọ ha na-eme nchọpụta karịa ka ha nọrọ n'izu mbụ, ha nọrọ izu 2+3 = izu 5 n'àgwàetiti ahụ. Na njem abụọ ahụ, ha nọrọ n'àgwàetiti ahụ maka ngụkọta nke izu 5 + 3 = 8. Na njem nke atọ ha mere, ha nọrọ izu abụọ karịa izu nke abụọ ha nọrọ n'àgwàetiti ahụ, nke bụ́ izu 2 * 5 = 10. N'oge njem atọ ahụ, ha nọrọ n'àgwàetiti ahụ ruo izu 10 + 8 = 18. Ebe ọ bụ na otu izu nwere ụbọchị asaa, ha nọrọ ụbọchị 18*7 = 126 n'àgwàetiti ahụ. Azịza ya bụ 126. <eng> If they spent two more weeks on their second research expedition than they spent on the first week, they spent 2 + 3 = 5 weeks on the island. In the two expeditions, they stayed on the island for a total of 5 + 3 = 8 weeks. On their third expedition, they spent twice as many weeks as they spent on the second week on the island, which is 2 * 5 = 10 weeks. In all three expeditions, they stayed on the island for 10 + 8 = 18 weeks. Since a week has seven days, they spent 18 * 7 = 126 days on the island.
The answer: 126. 