Each batch serves 6 people, and there are 42 people coming to the party, so she needs to make 42 / 6 = <<42/6=7>>7 batches.

Each batch requires 4 avocados, so she will need 4 * 7 = <<4*7=28>>28 avocados.

# Answer

28
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Allie's making guacamole for a party. Each batch requires 4 avocados and serves about 6 people. If 42 people are going to be at the party including her, how many avocados does she need?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
28
Allie's making guacamole for a party. Each batch requires 4 avocados and serves about 6 people. If 42 people are going to be at the party including her, how many avocados does she need?
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