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

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