Human: Sam sells bread. He has a target of selling 120 crates of bread in a week. One week he was closed on Monday and Friday. Over the weekend he sold 20 crates. On Tuesday he sold 15 crates, on Wednesday 12 crates, and Thursday 18 crates. By how many crates was Sam off from his target for the week? Assistant: 
How many crates did Sam sell in total? ** During the whole week Sam sold 15 + 12 + 18 + 20 = <<15+12+18+20=65>>65 crates.
How many crates was Sam off from his target for the week? ** Sam was off his target by 120 - 65 = <<120-65=55>>55 crates.
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