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?

Result

a =  45 m
b =  90 m

Solution:

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

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