Okay!
1. Take the $68 and subtract $5 from it for lunch
68
- 5
_____
63
2. Take your $63 and divide by 3.
(we are dividing by 3 because we know that she wants a haircut and a perm, but a perm costs twice(2) as much wich means we need to find how much one haircut is.)
3 divided by 3 = 21
3. Now you have a 21.
$21 = 1 haircut
21+21= $42 =1 perm (because the perm is twice the cost of the hair cut)
4. Add all together to make sure you have your numbers right!
$21(haircut)+$42(perm)+$5(lunch)= $68
Hope this helped!
:)
If you are still confused just let me know!