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Length of canal = 6 km
In 20 days canal made = 2 km
Remaining length of canal = 6 – 2 = 4 km
Remaining time = 35 – 20 = 15 days
In 20 days 2 km canal is made by = 90 men
In 1 day 2 km canal is made by = 90 x 20 men
In 15 days 2 km canal is made by = (90 × 20)/15 men
In 15 days 1 km canal is made by = (90 × 20)/(15 × 2) men
In 15 days 4 km canal is made by = (90 × 20 × 4)/(15 × 2) men = 6 x 10 x 4 men = 240 men
Number of more men to be employed to finish the work in time = 240-90 = 150 men
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