3x2.7=8.1,,, im not sure this is what you were asking for but i hope it helps
XoXo
I think it's 12x.
I'm not a 100% sure though, but I hope this helps. =^D
M=30/22,5=1,33
m=25/x=1,33. ...>x=25/1,33=18,7
1st gift shop:
120/4 = 30 cents each
180/6 = 30 cents each
390/13 = 30 cents each
2nd gift shop:
204/7 = 29.14 cents each
192/8 = 24 cents each
270 /9 = 30 cents each
360/10 = 36 cents each
so if both gift shops have a fixed price then the 9 post cards would be the answer since it matches 30 each like the 1st gift store
