karlrey73721 karlrey73721
  • 10-01-2024
  • Mathematics
contestada

X alone can do a piece of work in 15 days. Y alone can do the same work in 30 days. X, Y and Z, working together, can complete the work in nine days. In how many days Z alone can complete the same work?
a. 60
b. 90
c. 45
d. 120

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