Two ribbons

The total length of the two ribbons is 13 meters. If one ribbon is 7 and 5/8 meters long, what is the length of the other ribbon?

Correct result:

b =  5.375 m

Solution:

a=758=7⋅ 8+58=618=7.625 m s=13 m  a+b=s  b=s−a=13−7.625=438=438 m=5.375 m

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