300 mi race. If you are 20 mi closer to the finish than the start are many miles have you traveled?

The answer in the back of the book is: 160 mi. WHY?

I tried figuring out and i cant

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- September 22nd 2010, 08:55 PMyoman360300 mile race
300 mi race. If you are 20 mi closer to the finish than the start are many miles have you traveled?

The answer in the back of the book is: 160 mi. WHY?

I tried figuring out and i cant - September 22nd 2010, 09:00 PMWilmer
S............a...............[you].......a-20.........F

a + a-20 = 300 - September 22nd 2010, 09:01 PMundefined
Didn't understand what you meant at first, I see you mean you are 20 mi closer to the finish line than you are to the start line.

call your distance to start line x

then your distance to finish line is 300-x

we have 300-x = x-20

that is, your (distance to finish line) equals (distance to start line) minus 20.

solve for x. - September 22nd 2010, 09:07 PMyoman360
thanks I got 170 when i attempted it. I did this half 300=150 then 150 +20= 170 mi

- September 22nd 2010, 09:11 PMundefined