This much easier without using Venn diagrams
Total number of shoes = 30+ 40 + 25 = 95
32 stores carry exactly two of the shoe, thus the remaining shoes are = 95 -32*2 = 31
No store carries all three, so the remaining 31 shoes have to be carried by 31 stores
So the total number of stores =32 + 31 = 63
Total number of shoes = 30+ 40 + 25 = 95
32 stores carry exactly two of the shoe, thus the remaining shoes are = 95 -32*2 = 31
No store carries all three, so the remaining 31 shoes have to be carried by 31 stores
So the total number of stores =32 + 31 = 63