Question 332178
You can immediately subtract the $5 for lunch, to find that the haircut and perm will cost a total of $90.  You know that the perm costs twice as much as the haircut.


Let x = cost of haircut
Let 2x = cost of perm


x + 2x = 90
3x = 90
x = 30


Perm: 2x = 60


So the haircut is $30, the perm is $60, and the lunch is $5.


The haircut must cost