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 Class 8 mathematics questions and answers on indirect proportion

Eighteen pupils were given a playground to clear in 1h 40min. If six of the pupils did not turn up, how much longer did it take the rest of the pupils to clear the playground?
A. #33frac{1}{3}#min
B. 50min
C. 2h 30min
D. 3h 20min

 (6m 47s)
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