Atask completed by 30 persons in 4 days. in how many days, the same will be completed by 40 persons?

The number of branches on a tree demonstrates the fibonacci sequence. how many branches would there be on the next two levels of this tree? 13 | | | m branches

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?