Ok.. the answer to the first one is 0... You said the girls were ON the bus and then asked how many legs were IN the bus..
As for the second on, I came up with 8 days... someone check my math...
Day 1 = -10 +3= -7 -2= -9
Day 2 = -9 +3= -6 -2= -8
Day 3 = -8 +3= -5 -2= -7
Day 4 = -7+3= -4 -2= -6
Day 5 = -6 +3= -3 -2= -5
Day 6 = -5 +3= -2 -2= -4
Day 7 = -4 +3= -1 -2= -3
Day 8 = -3 +3= 0... He is out
Where did I go wrong?