Question 1122755
x is the number she bought
the oranges are 12 cents or $0.12 each, since there are 12 in a dozen.
(4/5) of them were sold for 15 cents each (4 for 60 cents) and the rest at 12.5 cents each (2 for 25 cents).
She gained $5.00
That means she had to make $5.00 (profit)+0.12x, the cost she paid for the oranges.
therefore, 
5.00+0.12x=.80x(0.15x)+.20x(0.125)
5.00+0.12x=0.12x+0.0250x
5.00=0.0250x
x=200 oranges or 16 dozen 8.  Assuming she can buy part of a dozen at the same cost, she paid $24 for the oranges and needed to make $29 overall.
She sold 160 oranges, 4/5, at 15 cents each for $24.  She sold 40 for 12.5 cents each for $5.
200 oranges ANSWER