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 Class 8 mathematics questions and answers on indirect proportion

A factory hired 9 people to complete a piece of work in 15 hours. How many more hours did it take them to complete the work if 3 people did not turn up?
A. 30 hours
B. #22frac{1}{2}# hours
C. 5 hours
D. #7frac{1}{2}# hours

 (4m 14s)
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