Sum
If 56 workers can build a wall in 180 hours, how many workers will be required to do the same work in 70 hours?
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Solution
Workers: Hours:: Workers: Hours
56 : 180 :: x : 70
∴ By inverse proportion
56 × 180 = x × 70
`⇒"x"=(180xx56)/70`
= 144 workers
Concept: Time and Work
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