The table shows the changes in elevation of a hiker each day for three days. How many miles of elevation must the hiker gain on the fourth day to gain $\frac{1}{4}$14​​  mile of elevation over the four days? Day Change in elevation (miles) 1 −1/4​​ 2 1/2​​ 3 −1/5​​ 4 $?$?​   The hiker must gain     miles of elevation on the fourth day.

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