1. Andy and Jackie each has some money. If Andy spends $80 per
day and Jackie spends $40 per day, Andy will have $550 left when
Jackie has spent all his money. If Andy spends $40 per day and
Jackie spends $80 per day, Andy will have $1100 left when Jackie
has spent all his money. Find the number of days Jackie will take
to spend all his money if he spends $40 per day.