dahalia bought granny smith and macintosh apples at the grocery store. the granny smith apples were $1.35 each if you bought 6. find the cost of each macintosh apple if the total cost was $15 and she bought 6 of each.
The total cost of the Granny Smith apples is 6 * $1.35 = $<<6*1.35=8.10>>8.10.
If Dahalia bought 6 of each apple, then she spent 2 * $8.10 = $<<2*8.10=16.20>>16.20 altogether.
Therefore, the cost of each Macintosh apple is ($15 - $16.20) / 6 = $<<15-16.20=1.20>>1.20. Answer: \boxed{1.20}.