How do i find out the answer to 50 is 40% of what number?

15 point ! ~ see if you know the answer to both you!

14 pointslet x be the seats in the small van and y the seats in the large van. how many seats does the large van have? a company uses two vans to transport worker from a free parking lot to the workplace between 7: 00 and 9: 00a.m. one van has 9 more seats than the other. the smaller van makes two trips every morning while the larger one makes only one trip. the two vans can transport 69 people, maximum.how many seats does the larger van have?

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.