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PLEASE HELP read the instructions:) I need help with 21,12,16,20,22

PLEASE HELP read the instructions:) I need help with 21,12,16,20,22-example-1
User Sujen
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12: 45 (11x4+1 for decimals) 16: 285 (712x.4+1 for decimals) 20: 6 (41/6--all following decimals) 21: 16 (148/9--all following decimals) 22: 3 (76/24--all following decimals) i really hope this helps :)
User Simply Good
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