<human>:  An alien invades Earth. It abducts 200 people. He returns 80% of the people abducted. After that he takes 10 people to another planet. He took the rest to his home planet. How many people did he take to his home planet?
<bot>: How many people did he return? ** He returned 200*.8=<<200*.8=160>>160 people
How many people did he have left? ** So he had 200-160=<<200-160=40>>40 people
How many people did he take to his home planet? ** He took 10 of those to another planet so he took 40-10=<<30=30>>30 to his home planet
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