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11 votes
11 votes
Mario charges $20 an hour plus a $15 flat fee. Luigi charges $18 an hour plus a $30 flat fee. After how many hours will the cost be the same?

User Nouman
by
2.8k points

1 Answer

13 votes
13 votes

Answer:

7.5 hours

Explanation:

if x is the hours, then

Mario will charge 20x + 15

Luigi will charge 18x + 30

so 20x + 15 = 18x + 30

20x - 18x = 30 - 15

2x = 15

x = 7.5 hours

User Zhengyang Liu
by
2.8k points