The far left column represents the 10's place and the digits to the right represent the 1's place.
look at the "3" row. How many digits are greater than 2? → 4,4,4,5,7 = 5 digits
How many digits are in the "4" row (representing ages in their 40's)? → 6 digits
How many digits are in the "5" row (representing ages in their 50's)? → 5 digits
How many digits are in the "6" row (representing ages in their 60's)? → 4 digits
How many digits are in the "7" row (representing ages in their 70's)? → 1 digit
How many customers are older than 32? 5 + 6 + 5 + 4 + 1 = 21
Answer: B
