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

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