So you have
1. Low money account balance
2. Negative degrees
3. Possible points in a game.
B represents the fraction of her crop for each store recieves
20 - 7 = 13
8 - 13 = 5
13 + 5 = 18
20 - 18 = 2
So two is your answer because.....
13 + 5 + 2 = 20
