Question

three persons a ,b and c decide to work in such a way that a and c work together on 1st day ,b alone on 2 nd day , a and c on 3 rd and so on on alternate days .how many days will be required to complete the whole work if c and d alone finished the whole work in 20 days and 34 days respectively and b is 70% more efficient than D but 20% less efficient than A

Answer 1

I don't know what is the answer I m sorry