Aaron used 10 scarves * 3 balls of wool = <<10*3=30>>30 balls of wool to make his scarves.
He also used 5 sweaters * 4 balls of wool = <<5*4=20>>20 balls of wool to make his sweaters.
Enid used 8 sweaters * 4 balls of wool = <<8*4=32>>32 balls of wool to make her sweaters.
So in total, Aaron used 30 + 20 + 32 = <<30+20+32=82>>82 balls of wool.
#### 82