Question
A book rental shop rented out books and the rate of rental charges are shown in the table.

Number of days Rates
After the first 9 days 60 cents a day
After 9 days 90 cents a day

Henry rented 3 books and was charged $37.80. How many days did he rent the books for?
2 m

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A book rental shop rented out books and the rate of rental charges are shown in the table.

Number of days Rates
After the first 9 days 60 cents a day
After 9 days 90 cents a day

Henry rented 3 books and was charged $37.80. How many days did he rent the books for?