Instructions:
The table describes the number of passengers entering and leaving at stations A, B, C ... Bus arrives without passengers at the first station. All passengers get off on the last station. We do keep rules of decency - first get off and then get in.
Example
A
B
C
D
E
got off
0 0
3 2
3 5
3 0
4 3
got on
4 2
0 0
in bus
4 2
4 5
altogether
7
Solution
A
B
C
D
E
got off
0 0
3 2
3 5
3 0
4 3
got on
4 2
3 5
2 1
4 2
0 0
in bus
4 2
4 5
3 1
4 3
altogether
6
9
4
7