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Answer:
8 4/7 days
Step-by-step explanation:
let together they will complete it in x days .
1/20 + 1/15 = 1/x
(3+4)/60 = 1/x
1/x = 7/60 => x = 60/7 = 8 4/ 7 days
they together will complete the embroidery on 8 4/ 7 days
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