Find The Sum of Second Column 

Answer:

You don't have to find the value of every symbol. The rows add up to 80, and this will be the sum of every symbol in the grid. 23 + 18 + 24 + 15 = 80.

Therefore the columns must also add to 80, making the missing column 14. 24 + 14 + 17 + 25 = 80.

@ = 7, & = 4, $ = 8, # = 3, £ = 5.