It depends on how the rest of the question is worded. If it says "how many were left," for example, that means to subtract. On the other hand, if it says something like "how many were added," it means to add.
add
Mark up would mean to add. Mark down would mean to subtract.
"How much ... all together ?" usually means add. "How much ... left ?" usually means subtract.
none of these
The opposite of add is subtract.
does how many mean add or subtract
it means to subtract
wich one
subtract
deposit = add withdraw = subtract
add
Mark up would mean to add. Mark down would mean to subtract.
you have to subtract because when you say hw many than you have to add when you say how much you have 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?
none of these