of all theswimmers, 7/10 got to the pool by car, 1/5 took the bus, and 1/6 walked. how many more came by car than on foot? How many fewer came by foot?
assistance needed
The common denominator is 30.
21/30 came by car
6/30 came by bus
5/30 walked
That adds up to more than 1, so something is wrong here, unless some people came by a combination of means.
21/30 - 5/30 = 16/30 = 8/15 is the answer to you first question.
Your second question in incomplete.
"How many fewer came by foot THAN BY ___?"