Both buses have 1400 students in total. Bus A has 2/5 as many students as in Bus B. How many students must Bus B go to Bus A so that there are equal number of students in each bus?
A + B = 1400
A + n = B - n
A = 2 B/5
----------------------------------------
2 B/5 + 5 B/5 = 1400
7 B /5 = 1400
B/5 = 200
B = 1000
A = 400
(Those sure are big busses.)