To find how much stones she is ahead or back we will Subtract 63 from 68 which was her initial position.
So, Mona will be <em><u>5</u></em><em><u> </u></em><em><u>stones</u></em><em><u> </u></em><em><u>behind</u></em><em><u> </u></em><em><u>from</u></em><em><u> </u></em><em><u>the</u></em><em><u> </u></em><em><u>starting</u></em><em><u> </u></em><em><u>stone</u></em><em><u>.</u></em>
A: Distance between the Sycamore cabin to the Oak cabin is 30 yards. B: If she walks to the Mess Hall first she'll be 20 yards closer to the Elm cabin.