Stephanie wants to get 5 each of each type of silverware for herself. 5 spoons + 5 butter knives + 5 steak knives + 5 forks = <<5+5+5+5=20>>20 pieces of silverware
She wants 10 extra of each type for guests, 10 x 4 = <<10*4=40>>40
She decides to purchase less of each type. She was originally purchasing 15 of each type. 15 spoons - 4 less spoons = 11 spoons. 15 butter knives - 4 less = 11. 15 steak knives - 5 = 10. 15 forks - 3 less forks = 12.
Stephanie is going to purchase 11 spoons, 11 butter knives, 10 steak knives, and 12 forks.
11 + 11 + 10 + 12 = <<11+11+10+12=44>>44.
Stephanie is going to purchase 44 pieces of silverware.
#### 44