Let w be the number of wet wipes Elsie had in the morning.
Throughout the day, she used w-20 wet wipes.
Once that happened, she had to refill the container resulting in w-20+10 = w<<-20+10=-10>>-10 wet wipes.
By nighttime, she had w-10=60 wipes.
So then, w=60+10=<<60+10=70>>70.
She started with w=<<70=70>>70 wipes.
#### 70