5 books for 12 dollars because you basically getting a book free
[ Answer ]

[ Explanation ]
Area = 1420
Width = 
Area For Rectangle: Length · Width
Use division to find width:
1420 ÷ 
Convert mixed numbers to fractions:
1420 = 
= 
÷ 
Use mixed multiplication:

= 
Simplify:
= 
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Answer:
Its B
Step-by-step explanation:
93000000 times 2/5 is 37200000 aka 3.72 times 10 to the 7th power
The LCM of 15 and 25 is 75.