Repairing 80759

They spent three days repairing the damaged pipe, 115 m long. On the first day, they repaired a quarter of what they did on the second day, and on the third day, they repaired 20m less than on the second day. How many m of pipe did they repair on the first, second, and third day?

Correct answer:

a =  15 m
b =  60 m
c =  40 m

Step-by-step explanation:

a+b+c=115 a=b/4 c=b20  a+b+c=115 4ab=0 bc=20  Pivot:Row1Row2 4ab=0 a+b+c=115 bc=20  Row241 Row1Row2 4ab=0 1.25b+c=115 bc=20  Row31.251 Row2Row3 4ab=0 1.25b+c=115 1.8c=72  c=1.872=40 b=1.25115c=1.2511540=60 a=40+b=40+60=15  a=15 b=60 c=40

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