The answer depends on what you know and what you are trying to find.
wich one
does how many mean add or subtract
subtract
it means to subtract
deposit = add withdraw = subtract
add
Mark up would mean to add. Mark down would mean to subtract.
increase means to add or greater than
"How much ... all together ?" usually means add. "How much ... left ?" usually means subtract.
add? dont you mean subtract?
subtraction
none of these