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:

 30⋅ 9=x⋅ (9−3)  6x=270  x=45 min \ \\ 30 \cdot \ 9=x \cdot \ (9-3) \ \\ \ \\ 6x=270 \ \\ \ \\ x=45 \ \text{min}

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