She would run 1,287 meters in 3 days. First you have to divide 3,003 by 7 to find out how many meters she ran each day, you would get 429. Then you have to multiply that by 3 days to get 1,287.
Basically all what you need to do is find the amount that she had ran in total for a single day and then use that proportion to find the total amount that she would have ran for 3 days.
