Book reading

Suzan reads a book. If she read half an hour a day, she would read it in nine days. How many minutes does he have to read a day if he wants to read it three days earlier?

Correct result:

x =  45 min

Solution:

$$\begin{gathered} 30\cdot 9=x\cdot (9-3) \\ 6x=270 \\ x=45=45\text{ min} \end{gathered}$$

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