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Arte-miy333 [17]
3 years ago
13

18

Mathematics
1 answer:
ICE Princess25 [194]3 years ago
6 0

Answer:

4 hours

Step-by-step explanation:

Let x = hours

$78 = $20 + $12x

collect like terms

78 - 20 = 12x

58 = 12x

x = 4.8 hours

the maximum hours is 4 hours

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