lousia's saving change by - 59 each time she goes bowling. In all, it changed by-$99 during the summer. How many times did she go bowling in the summer?

1 time

Step-by-step explanation:

Lousia's saving changes by - $59 each time she goes to bowling, which means if she has gone to bowling at least twice, then her saving would go down to,

-$59*2 = - $118

but since her total expenses in the summer was only - $99, it is clear that she went to bowling only once, which means she spent $59 in bowling and rest $40 in other stuffs.