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If Petra read four pages more a day, she would read the book two days earlier than if she read six pages a day. How many pages does the book have?

Correct answer:

n =  30

Step-by-step explanation:

n=6 d n=(6+4) (d2)  6dn=0 10dn=20  Pivot:Row1Row2 10dn=20 6dn=0  Row2106 Row1Row2 10dn=20 0.4n=12  n=0.412=30 d=1020+n=1020+30=5  d=5 n=30

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