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Let the number of fruits each friend bought be x.
5 oranges + (x – 5) apples ——-> 7.80
11 oranges + (x – 11) apples ——-> 9
6 oranges – 6 apples ——-> 1.20
1 orange ——–> 1 apples + 0.20
x apples ——-> 7.80 – (5 x 0.20) = 6.80 or 9 – (11 x 0.20) = 6.80

Ans : $6.80.

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