 
<translate> Jodi da Vance suna bincike a tsibirin da ba shi da kowa kuma dole ne su zauna a tsibirin don wasu makonni don gudanar da binciken su. A tafiyarsu ta farko, sun yi makonni uku a tsibirin. Sun shafe makonni biyu a kan tafiyarsu ta biyu fiye da yadda suka kashe a kan tafiyarsu ta farko. Sun shafe makonni biyu a kan tafiyarsu ta ƙarshe kamar yadda suka yi a kan tafiyarsu ta biyu. Ka yi lissafin adadin kwanakin da suka yi a tsibirin a dukan tafiye-tafiyen. Bari mu zama daidai kamar yadda zai yiwu. <eng> Jodi and Vance are researching on a deserted island and have to stay on the island for a certain number of weeks to carry out their research. On their first expedition, they stayed for three weeks on the island. They spent two weeks more on the second expedition than they spent on their first expedition. They spent twice as many weeks on their last expedition as they spent on their second expedition. Calculate the total number of days they spent on the island on all the trips. Let's be accurate as possible. 