A tray of eggs has 30 eggs, so Kelsey brought 2/5*30 = <<30*2/5=12>>12 eggs
On the other hand, Stephanie brought 1/2*30 = <<1/2*30=15>>15 eggs to the party.
The total number of eggs that Kelsey and Stephanie brought to Willa's party is 15+12 =<<15+12=27>>27
Alayah brought 27+40 = <<27+40=67>>67 eggs, 40 more than the number brought by Kelsey and Stephanie combined.
Together with Aliyah's eggs, there were a total of 67+27 = <<67+27=94>>94
Willa also had 2*30 = <<2*30=60>>60 eggs from the two trays she had.
In total, there were 94+60 = <<94+60=154>>154 eggs used at the party.
#### 154