Kenny used 38 / 4 = <<38/4=9.5>>9.5 mushrooms on his pizza.

Karla used 42 / 4 = <<42/4=10.5>>10.5 mushrooms on her pizza.

Together, the twins used 9.5 + 10.5 = <<9.5+10.5=20>>20 mushrooms.

There are 8 / 4 = <<8/4=2>>2 mushrooms left on the cutting board.

GiGi cut up 20 + 2 = <<20+2=22>>22 mushrooms at the beginning.

# Answer

22
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
GiGi took out a big bowl of mushrooms from the refrigerator.  She cut each mushroom into 4 pieces.  Her twins, Kenny and Karla sprinkled mushrooms on their pizzas and baked them in the oven.  Kenny grabbed a handful and sprinkled 38 mushroom pieces on his pizza.  Karla scooped them up with both hands and sprinkled 42 mushroom pieces on her pizza.  On the cutting board, were 8 pieces of mushrooms remaining.  How many mushrooms did GiGi cut up at the beginning?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
22
GiGi took out a big bowl of mushrooms from the refrigerator.  She cut each mushroom into 4 pieces.  Her twins, Kenny and Karla sprinkled mushrooms on their pizzas and baked them in the oven.  Kenny grabbed a handful and sprinkled 38 mushroom pieces on his pizza.  Karla scooped them up with both hands and sprinkled 42 mushroom pieces on her pizza.  On the cutting board, were 8 pieces of mushrooms remaining.  How many mushrooms did GiGi cut up at the beginning?
train