Jasmine’s bags of chips weigh 20*6 = <<20*6=120>>120 ounces.
Jasmine buys 6*4 = <<6*4=24>>24 tins of cookies.
Jasmine’s tins of cookies weigh 9*24 = <<9*24=216>>216 ounces.
She has to carry 120+216=<<120+216=336>>336 ounces.
She has to carry 336/16=<<336/16=21>>21 pounds.
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