#inverse proportion word problems.

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umbral kestrel
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so the total amount of hours is 42 × 5,
after 2 works, hours is 42 × 2
remaining time is (42×5)-(42×2)
42 - 28 = 14 remaining people
so time took = [ (42×5)-(42×2) ] / 14

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so they start at 4pm

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then the 2 hours

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then the remaining time took

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which is 3 am

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which is 5 hours after 10pm

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it's just problem solving

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just have to follow your nose so to say

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and just try things