Football field

The soccer field may have a width of 45 meters. This is 45 meters less than the length of the course.
What can be the length of the football field?

Correct answer:

a =  45 m
b =  90 m

Step-by-step explanation:

$a=45\text{ m}$

$b=45+a=45+45=90\text{ m}$

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