In order to calculate fractions, you need to know two numbers ... the part and the whole. Since you didn't say 7 Oranges out of whatever the total is, we can't calculate a fraction.
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7/17 oranges per fruit.
Divide the total cost of the oranges $8.05 by the number of oranges 7 to get the cost per orange 1.15 then take the cost per orange and multiply it by the 3. 8.05/7=1.15 1.15X3=3.45 3 oranges cost $3.45
7 6/7 as a fraction
fraction: 2/7
7 out of 7 is a improper fraction due to the fact that both the numerator and the denominator are the same.