word problem for mathematics

Mathematics
Tutor: None Selected Time limit: 1 Day

May 20th, 2015

let their billy and bobby be x and y respectively

total time =x +y

x +y =101

x-y= 30

y=101-x

x-101 +x=30

2x=101+30

x=131/2

x=65.5

y=101-65.5

y=35.5

                       

Bobby will take 65.5 minutes which is 66 minutes

May 20th, 2015

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