First find how many days Cassidy is grounded for the low grades: 4 grades * 3 days/grade = <<4*3=12>>12 days

Then add that time to the 14 days she's grounded for lying to find the total grounding length: 12 days + 14 days = <<12+14=26>>26 days

# Answer

26
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Cassidy is grounded for 14 days for lying about her report card, plus 3 extra days for each grade below a B. If Cassidy got four grades below a B, how long is she grounded for?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
26
Cassidy is grounded for 14 days for lying about her report card, plus 3 extra days for each grade below a B. If Cassidy got four grades below a B, how long is she grounded for?
train