There are 60 squares of size 1x1. There are 35 squares of size 2x2. There are 12 squares of size 3x3. There are 3 squares of size 4x4.
A total of 60 + 35 + 12 + 3 = 110.
Starting in the bottom left corner and moving either up or right, one square at a time, adding up the numbers along the way, what is the largest sum which can be made once you have reached the top right corner?
Hint: Perhaps looking around the shapes will help.
The shapes are the spaces between the digits in the numbers 27, 28, 29 and 30, therefore C is the correct answer, as it is the space between the digits in the number 31.