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31-10-2021
Mathematics

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Nathan is a plumber. He charges a fixed fee of $50 for a house visit and $20 per hour when he has to perform emergency repairs. Sydney calls Nathan to repair a flooded bathroom and he charges her $130. How many hours did Nathan spend fixing the problem?

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31-10-2021

Answer: 3.5 hours

Step-by-step explanation:

$50+20=

$70 1 hour

$70+20=

$90 2 hours

$90+20=

$120 3 hours

$120+10 (add ten because half an hour) =

$130

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