20 * 13 = <<20*13=260>>260 square yards

3 * 5 = <<3*5=15>>15 square yards

260 - 15 = <<260-15=245>>245 square yards

Archie needs 245 square yards of sod.

# Answer

245
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Archie needs to lay sod in his backyard that measures 20 yards by 13 yards. He has a shed on it that measures 3 yards by 5 yards. How many square yards of sod will Archie need for his backyard?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
245
Archie needs to lay sod in his backyard that measures 20 yards by 13 yards. He has a shed on it that measures 3 yards by 5 yards. How many square yards of sod will Archie need for his backyard?
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