A, B and C can individually complete a piece of work in 30, 50 and 75 days respectively. They worked on one day each, with A starting the work followed by B the next day and C the next day. They continued working like this till the 30th day after which the remaining work was completed by B and C working on alternate days with B working on 31st day. In how many days was the work completed?

1) 50
2) 45
3) 40
4) 35