From Monday to Thursday, the cobbler can mend 3 x 8 = <<3*8=24>>24 pairs of shoes a day.
From Monday to Thursday, he can mend 24 x 4 = <<24*4=96>>96 pairs of shoes.
On Friday, he works for 11 - 8 = <<11-8=3>>3 hours.
On Friday, he can mend 3 x 3 = <<3*3=9>>9 pairs of shoes.
In a week, he can mend 96 + 9 = <<96+9=105>>105 pairs of shoes.
#### 105